Medieval architecture, its origins and development, with lists of monuments and bibliographies (1912)
Porter, Arthur Kingsley, 1883-1933 · New Haven, Yale University Press · leaf 124
the limits of the He de France it hadalready been employed in Limousin, Velay, Provence, and evenArtois, where the polygonal apse of St. Ulmer of Boulogne issaid to date from as early as the XI century. But in the Hede France itself the earliest instance known is the church ofCoudun (c. ll^o),… … III. 173. — St. (itrnuT. Intcrin POLYGONAL APSES IS is an apse polygonal externally (III. 174), and at Ciryanother example about contemporary. Nevertheless it was onlyin the second half of the century that this motive becamethoroughly established.*
Architecture, Medieval · Architecture
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