Overview
Isabel de la Cerda also known as Isabel de la Cerda Pérez de Guzmán (Seville c.1329 - after 1383) was the only surviving daughter of Luis de la Cerda and his first wife Leonor de Guzmán; she was Lady of Puerto de Santa María and titular Princess of Fortuna. She was a member of the House de la Cerda.
Life
Isabel was born in Seville around 1329, she was the youngest of three surviving children; her elder brothers were Luis and Juan de la Cerda y Guzmán, she had five other siblings who died in childhood. Her paternal grandfather was Alfonso de la Cerda, heir to the throne of Castile but disinherited in favor of his uncle, Sancho IV of Castile.
She first married in 1346 to Rodrigo Pérez Ponce de León; "Ruy Pérez Ponce de León" confirmed receipt of the dowry of "doña Isabel de la Cerda" by charter dated 11 March 1349. The couple were married up until before 26 May 1354, when Rodrigo died; they had no children.
A charter dated 30 December 1353 records the agreement between Isabel and her two brothers over their father's estate, who had died in 1348.
From Wikipedia (CC BY-SA 4.0).