Summit + dome transitions · 2 sourcessource-backed
- Location
- Highest central vault in many domed churches; not present in every Byzantine church.
- Function
- Creates an upward visual focus above the principal interior; ritual meaning depends on the specific program.
- Image relationship
- Middle Byzantine examples can place Christ Pantokrator at this summit, but that placement is not a timeless universal rule.
Uncertainty: Do not infer a dome Pantokrator in a church solely from its architectural type.
Summit + dome transitions · 2 sourcessource-backed
- Location
- Vertical zone directly beneath a dome, often pierced by windows.
- Function
- Mediates between the summit and lower church zones; exact ritual meaning is program-specific.
- Image relationship
- Figures may occupy the drum or window interstices; Kyiv places apostles in this upper zone.
Uncertainty: Drum imagery varies substantially across monuments.
Summit + dome transitions · 2 sourcessource-backed
- Location
- Concave triangular transition surface beneath a dome.
- Function
- Architectural transition; image significance depends on the program around it.
- Image relationship
- Evangelists occupy the pendentives at Saint Sophia in Kyiv; other churches use different imagery or construction.
Uncertainty: Do not turn the Kyiv example into a universal pendentive rule.
Summit + dome transitions · 2 sourcessource-backed
- Location
- Arched or niche-like transition supporting a dome, especially important in octagon-domed churches.
- Function
- Architectural transition that can also receive major narrative imagery.
- Image relationship
- Hosios Loukas places feast scenes in squinches; Daphni uses squinches within its monumental program.
Uncertainty: Squinches do not have one fixed iconographic subject.
Sanctuary + eastern focus · 5 sourcesfoundation
- Location
- Semicircular or polygonal eastern termination associated with the sanctuary in many churches.
- Function
- Closely tied to altar/sanctuary functions in many monuments.
- Image relationship
- Virgin-and-Child, praying Virgin, Transfiguration, and Anastasis can occupy apses in different monuments; no single subject is universal.
Uncertainty: Date, dedication, rite, and local program change the apse imagery.
Sanctuary + eastern focus · 2 sourcessource-backed
- Location
- Curved semi-dome surface crowning an apse or niche.
- Function
- Frames imagery above or around the sanctuary; function follows the specific church.
- Image relationship
- Can carry a dominant figure or scene adapted to the curved surface.
Uncertainty: Subject and scale vary by monument.
Sanctuary + eastern focus · 3 sourcessource-backed
- Location
- Eastern sanctuary area containing the altar in sources such as Nerezi and Kyiv.
- Function
- Principal clergy/Eucharistic zone in the cited monuments.
- Image relationship
- Bishop saints, Annunciation imagery, Pentecost, and Communion scenes can be coordinated with bema functions in specific programs.
Uncertainty: Bema boundaries and terminology vary with building form and source.
Sanctuary + eastern focus · 3 sourcessource-backed
- Location
- Sacred eastern liturgical zone, often differentiated from the congregational interior by architecture and/or a barrier.
- Function
- Contains or centers the altar and clergy-led Eucharistic rites.
- Image relationship
- Images in and around the sanctuary may echo Eucharistic, episcopal, incarnational, or heavenly themes.
Uncertainty: Terminology and boundaries are not identical across all periods and regions.
Sanctuary + eastern focus · 3 sourcessource-backed
- Location
- Liturgical furnishing/focus within the sanctuary rather than an image-bearing wall zone.
- Function
- Center of Eucharistic celebration in the cited Byzantine church descriptions.
- Image relationship
- Nearby image subjects can gain additional meaning during the liturgy, but the image itself is not the altar.
Uncertainty: Exact altar form and furnishing are outside this BIU009 model.
Sanctuary + eastern focus · 1 sourcequalified-source-backed
- Location
- Side chamber associated with the eastern sanctuary at Nerezi.
- Function
- At Nerezi an eastern chapel connected to the bema could function as a prothesis.
- Image relationship
- No universal image subject is assigned by BIU009.
Uncertainty: Do not project the Nerezi arrangement onto every Byzantine church.
Sanctuary + eastern focus · 1 sourcequalified-source-backed
- Location
- Side chamber associated with the eastern sanctuary at Nerezi.
- Function
- At Nerezi an eastern chapel connected to the bema could function as a diakonikon.
- Image relationship
- No universal image subject is assigned by BIU009.
Uncertainty: Do not project the Nerezi arrangement onto every Byzantine church.
Assembly + circulation · 3 sourcessource-backed
- Location
- Main church interior in many Middle/Late Byzantine sources, distinct from the narthex and sanctuary.
- Function
- Primary congregational space in the Nerezi description and the central viewing field for many monumental programs.
- Image relationship
- Major figures, narratives, saints, and spatial icons can be distributed through its dome, vaults, walls, and transitions.
Uncertainty: Naos proportions, plan, access, and decoration vary by church type.
Assembly + circulation · 2 sourcessource-backed
- Location
- Longitudinal central aisle of a basilica such as Saint Catherine’s at Sinai.
- Function
- Carries congregational movement along the entrance-to-sanctuary axis.
- Image relationship
- Wall programs can flank the nave; the architectural term should not be substituted for naos in every church form.
Uncertainty: Terminology can overlap in modern description, so source wording governs each monument.
Assembly + circulation · 1 sourcesource-backed
- Location
- Circulation zone around a central core in centrally planned buildings such as San Vitale.
- Function
- Allows movement around rather than only along a central longitudinal axis.
- Image relationship
- The surrounding circulation changes how mosaics and architectural vistas are encountered; no universal icon set is assigned.
Uncertainty: Ambulatory form and liturgical use vary.
Thresholds + western zones · 3 sourcessource-backed
- Location
- Entrance vestibule west of the main interior in the cited Middle Byzantine examples.
- Function
- Can host entry-related or special ritual activity; Daphni/Hosios Loukas/Nea Moni provide source-specific examples.
- Image relationship
- Large Christ images and narrative scenes can shape entry; Foot Washing in three cited narthexes may relate to Holy Thursday ritual.
Uncertainty: There is no single narthex iconographic program.
Thresholds + western zones · 1 sourcesource-backed
- Location
- Outer narthex or additional western vestibule in monuments such as Chora.
- Function
- Adds another threshold and circulation layer before the inner narthex/naos.
- Image relationship
- Chora uses its double-narthex system for extensive narrative mosaics.
Uncertainty: Function and imagery are monument-specific.
Thresholds + western zones · 1 sourcesource-backed
- Location
- Western interior wall encountered in relation to entry/exit and the main interior.
- Function
- Can frame subjects seen while moving through or turning within the church.
- Image relationship
- At Chora the Dormition appears on the western wall of the naos.
Uncertainty: Orientation alone does not determine subject.
Thresholds + western zones · 1 sourcesource-backed
- Location
- Semicircular wall field under an arch or vault.
- Function
- Its role depends on the architectural compartment.
- Image relationship
- At Chora lunettes participate in the narthex narrative program; elsewhere subjects vary.
Uncertainty: Small architectural field with highly variable content.
Screens + devotional focus · 4 sourcessource-backed
- Location
- Sanctuary barrier separating congregational space from the bema/sanctuary while permitting varying degrees of visibility.
- Function
- Marks and mediates the boundary around the altar/clergy zone.
- Image relationship
- Middle Byzantine templons increasingly carried icons; later intercolumnar icon arrangements contribute to iconostasis development.
Uncertainty: Form, opacity, icon density, and chronology vary.
Screens + devotional focus · 2 sourcessource-backed
- Location
- Prominent location for a large devotional image near a sanctuary barrier or other focal church zone.
- Function
- Supports focused prayer and veneration in the cited monuments.
- Image relationship
- Nerezi has paired large proskynetaria icons flanking the templon; Chora preserves paired devotional images associated with the former templon.
Uncertainty: Exact form, framing, subject, and location vary.
Screens + devotional focus · 2 sourcessource-backed
- Location
- Later icon-bearing screen at the sanctuary boundary, developing from Byzantine templon traditions.
- Function
- Separates congregation from altar zone while organizing devotional images.
- Image relationship
- Painted icons could decorate the iconostasis in Middle/Late Byzantine and later Orthodox contexts.
Uncertainty: Do not project modern Orthodox iconostasis arrangements backward without evidence.
Chapels + upper spaces · 2 sourcessource-backed
- Location
- Side chapel attached to a larger church, with function defined by the specific monument.
- Function
- At Chora the parekklesion served as a funerary chapel.
- Image relationship
- Judgment and resurrection imagery is coordinated with the chapel’s funerary purpose at Chora.
Uncertainty: Parekklesia can have other functions.
Chapels + upper spaces · 1 sourcesource-backed
- Location
- Upper-level or elevated church space; access and function vary by monument.
- Function
- Can serve special audiences or functions; Hagia Sophia’s south gallery has imperial associations.
- Image relationship
- Hagia Sophia’s Deesis occupies the south gallery, showing that monumental devotional imagery also functioned outside dome/apse hierarchies.
Uncertainty: Access, patronage, and use vary.
Chapels + upper spaces · 1 sourcesource-backed
- Location
- Large upper wall field framed by arches in monuments such as Hagia Sophia.
- Function
- Provides prominent surfaces visible across the interior.
- Image relationship
- Hagia Sophia’s tympana received post-Iconoclast figural mosaics.
Uncertainty: Upper-wall field does not imply one standard subject.
Chapels + upper spaces · 2 sourcessource-backed
- Location
- Arch framing sanctuary/apse approaches in basilican and central-plan churches.
- Function
- Can visually link sanctuary imagery to the larger church interior.
- Image relationship
- Sinai and San Vitale preserve major mosaic programs around the eastern focus.
Uncertainty: Architectural terminology and program vary.
Church forms + program structure · 2 sourcessource-backed
- Location
- Compact domed plan organized around a roughly square naos with a cross-shaped spatial core and eastern sanctuary.
- Function
- Supports combined horizontal and vertical viewing axes.
- Image relationship
- Monumental image programs adapt to dome, pendentives, vaults, arms, narthex, and sanctuary zones.
Uncertainty: There are many variants and later adaptations.
Church forms + program structure · 2 sourcessource-backed
- Location
- Longitudinal church plan organized around a nave/aisles and eastern apse.
- Function
- Creates a strong entrance-to-altar axis.
- Image relationship
- Wall and apse programs are experienced along that longitudinal movement.
Uncertainty: Byzantine basilicas vary by date, region, and function.
Church forms + program structure · 2 sourcessource-backed
- Location
- Domed church type using eight supports and often squinches, allowing complex transitional surfaces.
- Function
- Creates a strong centralized vertical focus while retaining an eastern sanctuary.
- Image relationship
- Hosios Loukas and Nea Moni show different ways mosaics can occupy squinches, conches, niches, and dome-related zones.
Uncertainty: Type permits substantial variation.
Church forms + program structure · 1 sourcesource-backed
- Location
- Interpretive model in Byzantine texts and modern scholarship for understanding the domed church as a three-dimensional image of the cosmos.
- Function
- Can connect architectural hierarchy with worship unfolding below.
- Image relationship
- A heavenly summit, sacred history, and saints around worshippers often form a comparative hierarchy in Middle Byzantine examples.
Uncertainty: Not every church or period fits the same hierarchy.
Church forms + program structure · 1 sourcesource-backed
- Location
- Interpretive term for monumental figures/scenes that engage curved architectural surfaces and appear to share the worshipper’s space.
- Function
- Highlights the embodied encounter with imagery during movement and worship.
- Image relationship
- Figures can face, answer, or relate across architectural space instead of behaving like isolated framed pictures.
Uncertainty: Use as a comparative lens, not object metadata.
Monuments + regional variation · 2 sourcessource-backed
- Location
- Eleventh-century katholikon with an octagon-domed plan and major mosaic program.
- Function
- Narthex, naos, bema, and apse form a sequence experienced during worship.
- Image relationship
- Pantokrator at the narthex threshold, feast scenes in squinches, Pentecost over the altar area, and Virgin and Child in the apse create a specific coordinated program.
Uncertainty: The surviving program should not be universalized.
Monuments + regional variation · 2 sourcessource-backed
- Location
- Eleventh-century Chios monastery church with a distinctive octagon-domed interior.
- Function
- Narthex, naos, eastern apse, and dome-transition zones organize worship and viewing.
- Image relationship
- Narratives occupy conches/niches; a praying Virgin appears in the apse; upper-zone figures survive beneath the lost dome mosaic.
Uncertainty: Its plan and program differ significantly from Hosios Loukas and Daphni.
Monuments + regional variation · 1 sourcesource-backed
- Location
- Middle Byzantine cross-in-square monastery church near Athens.
- Function
- Entry through the narthex leads into a domed naos and eastern sanctuary.
- Image relationship
- Pantokrator dominates the dome; narrative scenes unfold below; the apse carries Virgin and Child.
Uncertainty: Dating and some program details remain broad.
Monuments + regional variation · 1 sourcesource-backed
- Location
- Five-domed 1164 church with frescoes, templon evidence, and large devotional icons.
- Function
- Narthex, naos, and bema structure the main church; eastern chapels connect to sanctuary functions.
- Image relationship
- Bishop saints in the bema and proskynetaria icons flanking the templon link subject, role, and location.
Uncertainty: Nerezi is a specific Macedonian monument, not a universal template.
Monuments + regional variation · 2 sourcessource-backed
- Location
- Late Byzantine Constantinopolitan church complex with double narthexes and a funerary parekklesion.
- Function
- Different compartments support different devotional, narrative, and funerary functions.
- Image relationship
- Narthex cycles, naos proskynetaria/Dormition, and parekklesion judgment/resurrection programs form distinct spatial sequences.
Uncertainty: Program reflects a specific fourteenth-century patronal project.
Monuments + regional variation · 3 sourcessource-backed
- Location
- Justinianic Great Church in Constantinople with a massive pendentive dome and centuries of changing decoration.
- Function
- Cathedral and imperial functions changed how different zones were used and seen over time.
- Image relationship
- Post-Iconoclast Virgin and Child in the apse, tympanum saints, and later Deesis in the south gallery belong to different moments and spatial contexts.
Uncertainty: A long-lived building contains multiple historical programs.
Monuments + regional variation · 1 sourcesource-backed
- Location
- Sixth-century basilica at Saint Catherine’s Monastery with a major apse/conch Transfiguration mosaic.
- Function
- Longitudinal nave leads toward the sanctuary and apse.
- Image relationship
- The Transfiguration occupies the eastern apse/conch within a pre-Iconoclast figural program.
Uncertainty: The surviving apse is unusually important but not a universal early Byzantine model.
Monuments + regional variation · 1 sourcesource-backed
- Location
- Sixth-century centrally planned octagonal church in Ravenna with an eastern sanctuary extension.
- Function
- Sanctuary/chancel mosaics integrate Eucharistic, imperial, and sacred imagery around the altar.
- Image relationship
- Christ in the apse, Lamb above the altar, and imperial panels flanking the sanctuary create a specific eastern-end program.
Uncertainty: It is Byzantine-related imperial art outside Constantinople and should not be generalized to every Byzantine church.
Monuments + regional variation · 1 sourcesource-backed
- Location
- Eleventh-century cathedral in Kyiv whose mosaics strongly reflect Byzantine church-decoration traditions.
- Function
- Dome, pendentives, bema, and apse coordinate upper hierarchy with Eucharistic sanctuary imagery.
- Image relationship
- Pantokrator in the dome, evangelists on pendentives, Annunciation in the bema, praying Virgin and Communion below in the apse/sanctuary create a documented regional program.
Uncertainty: Local language, patronage, and political context matter.
Monuments + regional variation · 1 sourcequalified-source-backed
- Location
- Lost imperial palace church in Constantinople described by Photios after Iconoclasm.
- Function
- Its mosaic-rich interior was experienced in court/church ritual contexts now known only through texts and comparison.
- Image relationship
- Photios describes an enveloping, glittering mosaic interior; BIU uses it as context for later surviving Middle Byzantine programs.
Uncertainty: Textual description cannot recover the full visual program.
