John of Córdoba

John of Córdoba was a martyr in Córdoba, in Muslim-⁠ruled Spain, in the first half of the 9th century. He is remembered on 27 September.

His father was a Muslim and his mother, Artemia, a Christian. After his father's death John moved to Córdoba with his mother, his brother Adolphus and his sister Aurea. There John and Adolphus professed the Christian faith, which roused the anger of their relatives on the father's side. The two brothers were arrested by the emir Abd ar-⁠Rahman II and died as martyrs, around 822 to 824, as the sources differ.

Their mother entered a monastery at Cuteclara, where she later became abbess. Their sister Aurea was drawn by her brothers' example, embraced the Christian faith and entered the monastery too; she was martyred in 856 and is remembered on 19 July.

John is a saint of the undivided Church, honored mostly in the West; no Orthodox synodal canonization is known.