The Apse's Journey From Roman Law Court To Christian Sanctuary

Like the nave it terminates, the apse derives from the Roman basilica, where in its secular civic use the semicircular recess at one end of the hall held the magistrate's raised tribunal seat, the point from which legal judgments were formally delivered to those assembled in the hall before it. Christian builders repurposed this same architectural gesture for a very different kind of authority, placing the altar and the bishop's seat, the cathedra, in the position the magistrate had occupied, so the apse carried directly across from Roman civic architecture into Christian church design a spatial statement about where authoritative pronouncement happens within the building.

Over the following centuries the apse became the standard focus for a church's most ambitious decorative programs, and regional traditions developed distinctive treatments of the form: Byzantine and Eastern churches typically favor a single dominant apse mosaic of Christ Pantocrator or the Theotokos, Romanesque churches in the West often combine a rounded apse with a full ambulatory and radiating chapels for pilgrimage traffic, and later Gothic cathedrals sometimes replace the simple rounded apse with a polygonal chevet, a more complex east end integrating the apse, ambulatory and chapels into a single unified, heavily glazed architectural composition.