Modern Hagiography
Lives of the Saints by Alban Butler.
Lives of the Saints by Sabine Baring-Gould.
Miniature Lives Of The Saints For Every Day In The Year by Henry Sebastian Bowden.
Stories of the Saints Fourth Series Saints of the Early Church by Mary Seymour.
Medieval Hagiography
Bede, Ecclesiastical History (search for other mentions)
Art & Architecture
Post-Biblical Saints Art Index
Lives and Legends of the English Bishops and Kings, Mediaeval Monks, and Other Later Saints by Mrs. Arthur Bell.
The Saints in Art by Joseph Maria von Radowitz.
Emblems of Saints by Which They Are Distinguished in Works of Art by F. C. Husenbeth.
Nihil sub sole novum 