St. Leonides of Alexandria was a Christian martyr

Martyr

A martyr is somebody who suffers persecution and death for refusing to renounce, or accept, a belief or cause, usually religious.-Meaning:...

 of the 3rd century AD

Anno Domini

and Before Christ are designations used to label or number years used with the Julian and Gregorian calendars....

. According to the Christian historian Eusebius

Eusebius of Caesarea

Eusebius of Caesarea also called Eusebius Pamphili, was a Roman historian, exegete and Christian polemicist. He became the Bishop of Caesarea in Palestine about the year 314. Together with Pamphilus, he was a scholar of the Biblical canon...

, his son was the early Church father Origen

Origen

Origen , or Origen Adamantius, 184/5–253/4, was an early Christian Alexandrian scholar and theologian, and one of the most distinguished writers of the early Church. As early as the fourth century, his orthodoxy was suspect, in part because he believed in the pre-existence of souls...

. In the same passage Eusebius tells us that Leonides was martyred during the persecution of the Roman emperor Septimus Severus in the year 202 AD. Condemned to death by the Egyptian prefect Lactus, he was beheaded, and his property seized. The feast of St. Leonides is celebrated on April 22.