Modern Hagiography
Lives of the Saints by Alban Butler.
Lives of the Saints by Sabine Baring-Gould.
Contemporary Hagiography
The Cult of Saints in Late Antiquity Database
Writings of Pope Agatho
Letters – to the Sixth Ecumenical Council, to the emperor, and to his legates.
Art & Architecture
Catalogo generale dei beni culturali
– Chiesa di Santa Maria in Organo, Sacristy, B&W photo of fresco
– Chiesa di San Pietro in Bisceglie, B&W photo of wood carving in choir stall
– Basilica di San Pietro in Perugia, B&W photo of fresco
– Abbey of Farfa, B&W photo of fresco, visible in situ
Warburg Institute Iconographic Database
… who relies on …
… but the volume on the frescoes in I monasteri di Subiaco makes no mention of Saint Agatho. As seems to be a common practice, the Index relies on a non-scholarly source that has probably used “generic” images to portray specific saints.
Nihil sub sole novum 
