Caterina dei Vigri/St. Catherine (1413-1463): Caterina was born into a noble family in Bologna, Italy. She was educated at the court of Ferrar and became a nun in 1427. She was skilled not only in painting, but in music and illumination. She became Abess of the Convent of the Poor Clares and was canonized in 1707. She is regarded as the patron saint of painters, but few of her own paintings survive including one of St. Ursula.
References: Women, Art and Society by Whitney Chadwick, pp.88-89;
The Obstacle Race by Germaine Greer, pp. 174-176.
Biography of Saint Catherine

Maria Ormani: Fifteenth century Florentine nun of the Augustinian order. She was a manuscript painter whose self-portrait is included in the Breviary cum Calandario painted around 1453.
References: Seeing Ourselves: Women's Self-Portraits by Frances Borzello, pp. 37-38; Women, Art and Society by Witney Chadwick, p. 68.