Diego Fernández de Córdoba (died November 1435) was a Castilian nobleman who served as the of the Kingdom of Córdoba and as the first ..
Diego was the son of Gonzalo Fernández de Córdoba and María García. King John I () appointed him the first marshal of the kingdom and in 1386 gave him the village of Baena. Henry III appointed him tutor to his son, the future John II (born 1405). In 1407, he took part in the siege of Setenil. In the spring of 1410, as , he negotiated a truce with the Kingdom of Granada. Later that year, he took part in the under the regent Ferdinand. In 1431, he took part in Álvaro de Luna's campaign against Granada.
Diego's first wife was Sancha de Rojas, . From her inheritance he created a for his eldest son, Juan Rodríguez de Rojas. His second son, Pedro Fernández de Córdoba, was to receive the lordship of Baena as his , but he predeceased his father by two months. His third son, , entered the church.
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