St. Elizabeth of Portugal, was born the daughter of Pedro III of Aragon in the Aljaferia Palace in Zaragosa in 1271. At the age of 22 she married King Dionis of Portugal, and spent her life in charitable works. When she widowed, she took the habit of the Poor Clares, founding this order in Coimbra, where she died. She was canonized by Pope Urban VIII in 1626.
See: Francisco de Zurbarán St. Elizabeth of Portugal, this painting was traditionally identified as St. Casilda, because this saint is also depicted with roses (food miraculously changed into roses) in the folds of her dress.
The Book of Saints: The Lives of the Saints According to the Liturgical Calendar by George Angelini, Victor Hoagland (Editor). Regina Press, Malhame & Company, 1986.
365 Saints: Your Daily Guide to the Wisdom and Wonder of Their Lives by Woodeene Koenig-Brick (Author). Harper SanFrancisco, 1995.