Constanza Manuel

Constanza Manuel (c. 1318–1345/1349) was the daughter of the Castilian magnate and writer Juan Manuel and Constance of Aragon. In 1325 her father wedded her to Alfonso XI, who repudiated her in 1327 to marry Maria of Portugal.

Betrothed in 1335 to the Portuguese heir Pedro, she was imprisoned by Alfonso in Toro to block the match; the proxy wedding nonetheless took place at Évora on 28 February 1336. Once in Portugal, she bore Pedro a daughter, Maria, in 1342, and the future Ferdinand I in 1345, before dying in childbirth.