basileus, basileis (Gr., "king"): the main title for the Eastern Roman Emperor, used in conjunction with the words "of the Romans," on seals as early as the seventh century. The title was used in conjunction with autokrator.

basilica (Lat., "courthouse"): church type based on the timber-roofed, longitudinal Roman hall of justice or meeting hall; such basilicas had one or two apsidal projections, a nave lit by clerestory windows and side aisles. The transformation of this architectural type for Christian worship included the focus on a single apse, to be used to house the altar.

bema: (Gr., Raised step, tribune): area of the church containing the altar.

bifolium, bifolia: sheet of parchment or paper folded to form two leaves or four pages in codex.

boyar (bojar): term used for the military landed aristocracy in Bulgaria, Kievan Rus and later the Muscovite State.

bulla (Lat., "locket"): seal attached to a document, see chrysobul.




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View an online gallery tour in a feature related to the "Byzantium: Faith and Power (1261–1557)" exhibition.

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