On the late 12C Verdun Altar (see also) in the Abbey of Klosterneuburg, between the circumcisions of Isaac and Samson.
Consummati sunt dies octo, ut circumcideretur puer.
Eight days were accomplished, that the child should be circumcised.
Luke 2.21
By his own blood, he entered into the holies.
Per proprium sanguinem introivit in Sancta.
Hebrews 9.12
Sponsus sanguinum ob circumcisionem.
A bloody spouse art thou to me, because of the circumcision.
Exodus 4.26
The Liturgical Year by Dom Guéranger
Heortology: A History Of The Christian Festivals From Their Origin To The Present Day by Heinrich Kellner (Paul, Trench, Trübner, 1908).
The lives of saints, with other feasts of the year, according to the Roman calendar by Peter Ribadeneira.
Medieval Christology
The Golden Legend (and illustrations)
Sermons
Homilies Of Feasts And Sundays By Catholic Church Fathers by D. G. Hubert (Washbourne, 1901).
Sermons for the Sundays and Some Festivals of the Year by Thomas White.
Explanation of the Epistles and Gospels for the Sundays, holydays and festivals throughout the ecclesiastical year, to which are added the lives of many saints by Leonard Goffiné (Pustet, 1880).
Goffine’s Devout Instructions on the Epistles and Gospels for the Sundays and Holydays (Benziger, 1896).
The Catholic Pulpit: Containing a Sermon for Every Sunday and Holiday in the Year and for Good Friday (Murphy, 1851).
Readings for the Sundays and Holy Days of the Church’s Year (Bosworth, 1881).
Analysis of the Gospels of the Sundays of the Year by Angelo Cagnolo (Benziger, 1892).
Short Discourses for all the Sundays in the Year According to the Mind & Method of the Catechism of the Council of Trent by John McQuirk (St. Paul’s Library, 1908).
Meditations
The Way of Salvation: Meditations for Every Day of the Year by Saint Alphonsus Liguori.
Meditations for Every Day in the Year by Roger Baxter (Benziger, 1823, reprinted in 1884).
Meditations for All the Days of the Year by M. Hamon (Benziger, 1894).
Meditations on the Life, the Teaching and the Passion of Jesus Christ for Every Day of the Ecclesiastical Year by Augustine Maria Ilg (Benziger, 1901).
Meditations for the Use of the Secular Clergy by Pierre Chaignon (Benziger, 1907).
Daily Meditations on the Mysteries of Our Holy Faith and on the Lives of Our Lord Jesus Christ and of the Saints by Alonso De Andrade, and on the Holy Name of Jesus.
Music
Cantus: A Database for Latin Ecclesiastical Chant
Marc-Antoine Charpentier, In circumcisione Domini, H.316 & In circumcisione Domini / Dialogus inter angelum et pastores, H.406 (fin 1683)
Art
Catalogo generale dei beni culturali
POP : la plateforme ouverte du patrimoine
Warburg Institute Iconographic Database
Guide to Christian Iconography
Illustrations in the Golden Legend
ca. 1305 Fresco by Giotto in the Scrovegni Chapel
ca. 1463 Painting by Andrea Mantegna
ca. 1500 Painting by the workshop of Giovanni Bellini
ca. 1500 Seven Sorrows Polyptych by Albrecht Dürer
Customs & Devotions
Nihil sub sole novum 
