Abstract
A schematic plan of a cistercian church in the sketchbook of Villard de Honnecourt has been vaguely assigned to a prototype of cistercian church plan with the rectangular ambulatory. But the rectangular ambulatory is a distinctive creation of English mediaval architecture. While the plan of Morimond, with the rectangular ambulatory, is similar to Villard's plan, it has never been considered as a prototype. The "Bernardian plan" is largely recognized as a prototype, but the rectangular ambulatory never appears there. In this article, taking up three types of the cistercian chevet plan concerning the rectangular ambulatory, a typological analysis was made to clarify a characteristic of the Villard's plan. This paper verified that Villard's plan was unique among the cistercian church plans.