The Canons Regular are Catholic priests and religious brothers who live in community under a rule and are generally organised into religious orders, differing from both secular canons and other forms
Visitation memento mori, painter unknown, c.1500, juxtaposing pregnancy and death, with four Augustinan canons regular of the Chapter (Abbey) of Sion. Left, with little lion, is Jerome; right, holding a heart, is Augustine. Rijksmuseum