 The double cruciform plan entailed a cross with extensions at the inner corners.This became a model for later churches, for example, Mikkeli church (1754, destroyed 1806) and Lappee church (Juhana Salonen, 1794), the latter incorporating yet a further development, where the transepts of the cross plan are tapered and even chamfered at the corners, as one sees in the plan of the Ruovesi church (1776).Historian Lars Pettersson has suggested that the Katarina Church (1724) in Stockholm, by the French-born architect Jean de la Vallée was the model for the plan of Hamina church and hence the development that followed.