Tuscany; Arezzo; Arezzo Cathedral (Cattedrale dei Santi Pietro e Donato): portrait of Pope Gregory X above glass sarcophagus of Pope Gregory X (Tebaldo Visconti; 1210 - 1276; Pope 1271 - 1276); on 19th century white marble altar of San Silvestro; left nave; Pope Gregory X died in Arezzo; on 10th of January 1276; and was buried here; Arezzo cathedral is also burial place (body without head) of San Donato d`Arezzo (St Donatus of Arezzo; ? - 363 AD); second bishop of Arezzo; martyr; Saint and patron saint of Arezzo. Arezzo Cathedral was built 1278 - 1511; its facade was built 1901 - 1914.