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In ecclesiastical architecture, a retroquire (also spelled retrochoir), or back-choir, is the space behind the high altar in a church or cathedral, which sometimes separates it from the end chapel. It may contain seats for the church choir.
Notable example
An example of a retroquire is within Winchester Cathedral which was built between 1200 and 1230 to house a shrine for Saint Swithun.
References
Retroquire Wikipedia(Text) CC BY-SA