This altarpiece, made by Margarito of Arezzo around 1265, is the oldest one, on which I could recognize members of the Visconti lending their facial features to Saints. The great-uncle of Matteo I. Visconti, the mighty Milanese Archbishop Ottone Visconti (1207-1295), for example is lending his facial features to his personal favourite Saint John the Evangelist and also the other saints depicted on this altarpiece.
Die Frauen der Sforza I: Bianca Maria Visconti – Die Stammmutter der Sforza
nur als Buch (Farbband) bei amazon.de: 294 Seiten, mit Stammtafeln und 243 Bildern, Independently published, 1. Auflage 2020, ISBN 978-1-6515-0580-9, € 43,90