15 July – Saint Swithin

Benedictional of Aethelwold

Modern Hagiography

Bibliotheca Sanctorum

Sanctorale Catholicum

A Menology of England and Wales

Lives of the Saints by Alban Butler.

Miniature Lives Of The Saints For Every Day In The Year by Henry Sebastian Bowden.

Stories of the Saints for Children: The Black Letter Saints by Mrs. Molesworth.

Stories of the Saints Fourth Series Saints of the Early Church by Mary Seymour.

Lives and Legends of English Saints by L.M. Shortt.

Medieval Hagiography

BHL, Supplement 

Acta Sanctorum

Aelfric’s Sermon

The Golden Legend

Art & Architecture

Index of Medieval Art

ArtUK

Portrait in the 10th-century Benedictional of Aethelwold (scroll down to 97v in the far right drop-down menu)

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.

Lives and Legends of the English Bishops and Kings, Mediaeval Monks, and Other Later Saints by Mrs. Arthur Bell.

Saints and their Symbols: A Companion in the Churches and Picture Galleries of Europe by E. A. Greene.

Music

Cantus: A Database for Latin Ecclesiastical Chant

Devotions

Feast Day Cookbook

Saint Swithin’s Day and the Weather 

15 July – Saint Antiochus and Saint Cyriacus

Modern Hagiography

Bibliotheca Sanctorum

Roman Martyrology

Lives of the Saints by Sabine Baring-Gould.

Medieval Hagiography

Acta Sanctorum

The Cult of Saints in Late Antiquity Database

Art & Architecture

Catalogo generale dei beni culturali

BeWeB

15 July – The Separation of the Apostles

Annus Dierum Sanctorum
In omnem terram, exivit sonus eorum, et in fines orbis terra verba eorum.
Their sound hath gone forth into all the earth, and their words unto the ends of the whole world.
Romans 10.18
Misit illos binos ante faciem suam.
He sent them two and two before his face.
Luke 10.1

Separation, Dispersion, Division

Modern Hagiography

Lives of the Saints by Sabine Baring-Gould.

Biblical Texts

Mark 16.19-20

Matthew 28.19-20

Acts 15.22-41

Ancient and Medieval Hagiography

Acta Sanctorum

Eusebius, Ecclesiastical History

Art & Architecture

Warburg Institute Iconographic Database, also

Music

Cantus: A Database for Latin Ecclesiastical Chant