"Mara? de Molina (1259-1321) of Castile-Le?, was the wife of Sancho IV of Castile. She was queen consort of Castile and Le n from 1284 to 1295, and served as regent for her minor son Ferdinand IV (1295 - c.1301) and later her grandson Alfonso XI of Castile (1312-1321). She married her second cousin Sancho IV of Castile in 1282, the second son of Alfonso X the Learned, although the matrimonial dispensation for kinship was not previously granted. Upon the death of Alfonso X, she became queen consort of Castile-Le n and was crowned alongside her husband in the cathedral of Toledo. Although the couple was pressured to separate by Rome and others, Sancho chose to honor his wife and delegated many responsibilities to her, including the regency of their son after his death. His reign was short since he died in 1295. After the death of Sancho IV, he was succeeded by his eldest son Fernando IV, who was under age. Though according to the Cr nica de Sancho IV, Sancho designated Mar a as the sole regent, she was forced to share the regency with Sancho's uncle, Infante Enrique El Senador (Henry of Castile the Senator), younger brother of Alfonso X. Fernando's rule was challenged by a coalition that included his uncle, Infante Juan, his cousins the infantes de la Cerda, sons of the infante Fernando de la Cerda, eldest son of Alfonso X, as well as King James II of Arag n and King Dionisio I de Portugal." -- [Wikipedia]