F. Marion Crawford, Ave Roma Immortalis, Vol. 2
“ In our day the name is applied only to the immense pontifical palace adjacent to, and connected with, the basilica of Saint Peter's.The present existence of this palace is principally due to Nicholas the Fifth, the builder pope, whose gigantic scheme would startle a modern architect. His plan was [Pg 269] to build the Church of Saint Peter's as a starting point, and then to construct one vast central 'habitat' for the papal administration, covering the whole of what is called the Borgo, from the Castle of Sant' Angelo to the cathedral. ”
