» "Terracotta" history It was 1250 when “Castel della Pieve” was forced to give the necessary to pave the town-hall square. This is when Perugia starts using “cotto” even if this material is a “senese” tradition. Now “Città della Pieve” is the most important town for the manufacturing of cotto tiles. “Cotto Piazzai” continues to produce and manufacture cotto as tradition requires.