Although born in the region of Como, he signed his paintings as 'da Milano','from Milan'. First recorded in 1346 and again in 1363 in Florence, as a member of the Physicians'
Guild; he became a Florentine citizen in 1366. Probably identical with the 'Iohannes de Mediolano' who was working in the Vatican in 1369. His main works are
frescoes in the Rinuccini Chapel, Santa Croce, Florence, dated 1365.