Text and Translation at Wikipedia
The Liturgical Year by Dom Guéranger.
23 December – Saint Victoria of Tivoli
Modern Hagiography
Lives of the Saints by Alban Butler.
Lives of the Saints by Francis Weninger.
Lives of the Saints by Sabine Baring-Gould.
Our Birthday Bouquet Culled from the Shrines of the Saints and the Gardens of the Poets by Eleanor C. Donnelly.
Pictorial Half Hours with the Saints by Auguste François Lecanu.
Medieval Hagiography
The Cult of Saints in Late Antiquity Database
Art & Architecture
Catalogo generale dei beni culturali
Sanctuary of Santa Vittoria in Monteleone Sabino (her life here turns legendary).
Music
23 December – Saint Servulus
Vir, qui erat Claudus, quem ponebant quotidie ad portam templi, ut peteret eleemosynam ab introeuntibus in templum.
A man who was lame, whom they laid every day at the gate of the temple, that he might ask alms of them that went into the temple.
Acts 3.2
Modern Hagiography
Lives of the Saints by Alban Butler.
Lives of the Saints by Francis Weninger.
Lives of the Saints by Sabine Baring-Gould.
Anecdotes and Incidents: Ecclesiastical and Religious.
Contemporary Hagiography
Pope Gregory the Great spoke about Saint Servulus in his homily on the Parable of the Sower (Luke 8.4-15). He also wrote about him in his Dialogues.
Art & Architecture
Catalogo generale dei beni culturali
Death of San Servolo by Tommaso Chiari (info here and here)
Guide to Christian Iconography: Images, Symbols, and Texts
Emblems of Saints by Which They Are Distinguished in Works of Art by F. C. Husenbeth.
