Evasius was a third or fourth-century missionary and the Bishop of Asti in north-west Italy. Born in the province of Benevento, he is remembered as a martyr who faced persecution from either pagans or Arian opponents. Following his flight from Asti, he sought refuge in the Selva Cornea forest. There, he and many of his followers were eventually executed by beheading in the region of modern-day Casale Monferrato.