26 April – Saint Cletus & Saint Marcellinus

El Escorial Manuscript

Modern Hagiography

Roman Martyrology

Sanctorale CatholicumSaint Cletus.

Lives of the Saints by Alban Butler.

Lives of the Saints by Sabine Baring-Gould – Pope Cletus & Pope Marcellinus.

The Liturgical Year by Dom Guéranger.

Pictorial Lives of the Saints 

Our Birthday Bouquet Culled from the Shrines of the Saints and the Gardens of the Poets by Eleanor C. Donnelly – Pope Cletus.

Pictorial Half Hours with the Saints by Auguste François Lecanu – Pope Cletus.

The Lives of Saints, with Other Feasts of the Year, According to the Roman Calendar by Peter Ribadeneira.

La vie des saints

Tradition in Action – Pope Marcellinus

Medieval Hagiography

Pope Cletus – BHL & Supplement

Pope Marcellinus – BHL & Supplement

Acta Sanctorum – Pope Cletus & Pope Marcellinus

The Cult of Saints in Late Antiquity Database – Pope Cletus & Pope Marcellinus

Liber pontificalisPope Cletus & Pope Marcellinus

The Golden Legend Pope Marcellinus and Illustrations

Breviarium RomanumLatin & English.

Writings of Pope Cletus

Documenta Catholica Omnia

Writings of Pope Marcellinus

Documenta Catholica Omnia

Art & Architecture

Index of Medieval Art – Pope Cletus & Pope Marcellinus
El Escorial, Real Biblioteca, Cod. Vitrinas 17, folio 4v: SANCTVS CLETVS EPISCOPVS ET MARTYR TERCIVS VRBIS ROMAE A SANCTO PETRO (detail above)


Folio 5v: SANCTVS MARCELLINVS XXX PAPA (detail above)

Catalogo generale dei beni culturali – Pope Cletus & Pope Marcellinus

Portail Biblissima – Pope Marcellinus

Vatican Colonnade – Pope Marcellinus

Warburg Institute Iconographic Database – Pope Cletus & Pope Marcellinus

Post-Biblical Saints Art Index – Saint Cletus & Saint Marcellinus

Sistine Chapel, Entrance Wall

in situ
Die Sixtinische Kapelle