Lamb
Agnus Dei pun—small white lamb beside or in her arms.
Martyrs
Agnes of Rome
A lamb at her feet or held against her chest helps identify Agnes. Its Latin name, agnus, echoes the saint’s name.
Iconographic field guide
The lamb is not decorative theology: Agnes/agnus wordplay was preached in sermons artists knew. Zurbarán and Domenichino standardized the standing virgin with lamb at her feet. In confusion with the Baptist, check gender, age, and absence of cross staff.
Biography
Agnes was venerated in Rome as a young virgin martyr. Later narratives give different accounts of her trial and death. The lamb in her portraits evokes innocence and a Latin play on her name and agnus, the word for lamb.
Passio Sanctae Agnetis; Ambrose, De virginibus; Damasus epigrams; Prudentius, Peristephanon.
Martyred on the Via Nomentana; Constantina, daughter of Constantine, built a basilica over her tomb. Cult of youthful purity shaped medieval convent art.
Virgin consecrated to Christ; refused imperial marriage politics.
Beheading or sword after miraculous protections in legend.
Lamb, palm, long hair, youthful face; sometimes sword.
Wordplay on Agnes/agnus—almost diagnostic in solo portraits
Virgin martyr crowned with palm in Western art
Child-martyr type—often adolescent, not infant
Instrument of martyrdom in Roman tradition
Quick checklist
Lamb is the giveaway—only John the Baptist rivals it, and he is bearded with camel skin.
Patron of chastity and young girls; lambs blessed at her Roman basilica.
Often confused with John the Baptist: Both carry a lamb; Baptist has camel skin and cross staff
Often confused with Saint Lucy: Both virgin martyrs with palm; Lucy has eyes on a plate
Practice