 At the Time it had a name of "Sanctae Thomae de Yspanis" (of Spain), and later "San Tommaso dei Muratori", or "della Catena", or "dei Frati".The church was in disrepair, when Pope Gregory XIII Boncompagni, commissioned the Bolognese architect Ottaviano Mascherino to rebuild it as the national church of his countrymen.An adjacent oratory was built in 1601, but later razed.