Why did St. Rocco become a saint?

Roch, Roche, Rock, Rocco was a French noble who early developed a sympathy for the poor and sick.. Orphaned at age 20, he gave his fortune to the poor, and became a mendicant pilgrim. While on pilgrimage Roch encountered an area afflicted with plague. He stayed to minister to the sick, and affected several miraculous cures. He contracted the plague himself. He walked into a forest to die but eventually recovered. When Roch returned to Montpellier, France, he was arrested for being a spy. He languished in jail for five years, never mentioning his noble connections, cared for by an angel until his death.