Abstract
This paper deals with churches of circular plan in Italy during 17th-18th Centuries, and, in particular, takes up several examples deriving from the Temple of Romulus, which was regarded as a model of church in 17th Century. Furthermore the investigation gives attention to the influence of Giovanni Battista Montano, and makes clear that Filippo Juvarra's work in the early 18th Century belongs to the same type. The purpose is to show the relationship between circular plan and curved facade in clerical architecture by clarifying mechanism of architectural composition. In short, circular plan together with curved facade is not only a model of the building itself, but also a motif in composition of large scale.
