Giovanni di Stepano da Siena
The old basilica of the Lateran was ruined by fire August 21, 1361. There is a letter by Petrarch to Urban V (Pope 1362-1370) at Avignon, describing the condition of the building and urging its restoration. The reconstruction was begun at once. The architect employed was Giovanni di Stefano da Siena. From 1372 to 1389 he was supervising architect of the cathedral of Orvieto.