Modern Hagiography
Martyrologium Romanum (6 April)
Lives of the Saints by Alban Butler.
Lives of the Saints by Sabine Baring-Gould.
The Liturgical Year by Dom Guéranger.
Our Birthday Bouquet Culled from the Shrines of the Saints and the Gardens of the Poets by Eleanor C. Donnelly.
Miniature Lives of the Saints for Every Day in the Year
Stories of the Saints Fifth Series by Mary Seymour.
Short Lives of the Dominican Saints
The Lives of Saints, with Other Feasts of the Year, According to the Roman Calendar by Peter Ribadeneira.
Modern life in English based on 17th-century life collected by Antoine Touron
The 17th-century life in French (page 524 of the pdf, epitaph by Saint Thomas Aquinas on page 551 )
Medieval Hagiography
The Golden Legend (and illustrations)
Breviarium Romanum – Latin & English.
Art & Architecture
Catalogo generale dei beni culturali
POP : la plateforme ouverte du patrimoine
Warburg Institute Iconographic Database
A Guide to Christian Iconography: Images, Symbols, and Texts
Medieval Religion Listserv – 2016 Dillon.
Online Exhibition: Tune In To Lorenzo Lotto on his Madonna and Child with St. Peter Martyr
The Ark of Saint Peter Martyr in the Portinari Chapel in the Chiostro Sant’Eustorgio in Milan – see also, Wikimedia Commons, above
Fra Angelico, Saint Peter Martyr Altarpiece
The Story of Peter Martyr in the Spanish Chapel of Santa Maria Novella in Florence
Martyrdom of Saint Peter in the Cappella Tornabuoni, Santa Maria Novella in Florence
Paintings by Pedro Berruguete – Saint Peter Martyr Praying (above), Death of Saint Peter Martyr, Adoration of the Tomb of Saint Peter Martyr
The Assassination of Saint Peter Martyr (Titian)
Post-Biblical Saints Art Index
Legends of the Monastic Orders as Represented in the Fine Arts by Mrs. Jameson.
A Handbook of Christian Symbols and Stories of the Saints as Illustrated in Art by Clara Erskine Clement.
A Garner of Saints: Being a Collection of the Legends and Emblems Usually Represented in Art by Allen Hinds.
Lives and Legends of the English Bishops and Kings, Mediaeval Monks, and Other Later Saints by Mrs. Arthur Bell.
The Saints in Art with Their Attributes and Symbols, Alphabetically Arranged by Margaret E. Tabor.
Saints and their Symbols: A Companion in the Churches and Picture Galleries of Europe by E. A. Greene.
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.
Sacred Symbols in Art by Elizabeth Edwards Goldsmith.
Music
Cantus: A Database for Latin Ecclesiastical Chant
Customs & Devotions
Nihil sub sole novum 
