Leocritia (Spanish Lucrecia) was born around 841 to a Muslim-Berber noble family of Córdoba — the social class that had crossed the Strait of Gibraltar from North Africa to settle the Umayyad al-Andalus.
At about age 16 (c. 857), she was secretly catechized and baptized into the Mozarabic Catholic faith by her Christian kinswoman Litiosa. Her Muslim parents, on discovering her conversion, beat her and confined her to the house — but she escaped to the protection of St. Eulogius of Córdoba and his sister St. Anulona, who hid her among the Mozarabic Catholic community of the city.
After several months of concealment, she and Eulogius were betrayed and arrested by the Umayyad authorities. Both were taken before the qadi (Islamic judge): Eulogius for the capital offence of sheltering a Muslim apostate, Leocritia for the capital offence of apostasy from Islam.
Eulogius was beheaded on March 11, 859 — the learned theologian-priest-archbishop-elect and documentary historian of the Córdoba martyr-cycle. Leocritia was beheaded four days later, on March 15, 859 — her body thrown into the Guadalquivir river, where it was recovered by Mozarabic Catholic Christians and buried at the Mozarabic Catholic basilica of San Zoilo in Córdoba.
Her martyrdom (with that of Eulogius) closed the nine-year Córdoba martyr-cycle of 850–859 — the forty-eight or forty-nine documented Mozarabic Catholic martyrs whose protest-witness against the Umayyad-Islamic state of al-Andalus is the primary text of Catholic Christian-Islamic martyrdom literature.

