Constanza de Castilla was granddaughter of Pedro I and prioress of the monastery of Santo Domingo el Real in Madrid from approximately 1416 to 1465. The devotionary comprises a variety of prayers and liturgical offices in Spanish and Latin intended for use primarily by herself and by other women. This edition offers an introduction and notes explaining obsolete language and identifying biblical and liturgical sources, and indexes of the biblical citations and the linguistic notes.
Constanza de Castilla, Reina de Castilla was the daughter of Pedro I de Castilla, Rey de Castilla and Maria de Padilla. She was born in 1354 and died on 24 March 1394 in Leicester, England. She is buried at Newark Abbey, Leicester, Leicestershire, England.