Early Christian popularized by Renaissance painters and believed to have been martyred during the persecution of Christians by the Roman emperor Diocletian.
According to his legend he was born in Gaul, went to Rome, and joined (c. 283) the army of the emperor Carinus, later becoming a captain under Diocletian.
When it was discovered that he was a Christian who had converted many soldiers Sebastian was ordered to be killed by arrows.
The archers left him for dead but a Christian widow nursed him back to health.
He then presented himself before Diocletian who condemned him to death by beating.
His body, thrown into a sewer, was found by another pious woman, who dreamed that Sebastian told her to bury his remains near the catacombs..
His relics are believed to be in the basilica of S. Sebastiano on the Appian Way, to which many pilgrims were attracted in the Middle Ages.
Sebastian´s martyrdom was a favourite subject of Reinassance artists and it was depicted by among others, Bernini, Botticelli, Mantegna, Perugino and El Greco.
The saint is usually shown as a handsome youth pierced by arrows.
His feast day is January 20.