Simeon the Holy Fool (Abba Simeon, Saint Simeon Salos or Saint Simeon Salus, for ancient Greek Σάλος, “stir”) was a Christian monk, hermit and saint of Byzantine-Syrian origin, who lived in the sixth century AD. He is venerated by the Eastern Orthodox Church and Roman Catholic Church as one of the first "yurodivy" ("fool for Christ").
Reportedly born in Edessa, Simeon lived there, unmarried, with his old mother. At the age of 20 years Simeon took monastic vows in the monastery of Abba Gerasimus in Syria, along with his friend and fellow ascetic John from Edessa. After that Simeon and John spent about 29 years in desert near the Dead Sea practicing asceticism and spiritual exercises. Later Simeon was urged by inspiration of God, as some sources say, to move to Emesa to perform social and charitable services. Reportedly the saint asked the Lord to permit him to serve people in such a way that they should not acknowledge him. At Emesa, through simulating madness and upsetting conventional rules, he was able to bring many citizens to repentance, save many souls from sin and convert them to Christianity.
Simeon entered the gate of Emesa (after spending many years in desert) dragging a dead dog. Schoolchildren saw him and shouted (κράζειν) "Hey, a crazy abba...". The next day, a Sunday, he entered the church, extinguished the lights and threw nuts at women. On the way out of the church, Simeon overturned (έστρεψεν) the tables of the pastry chefs (πλακουντάριοι). Such playing the fool was subject to insults, abuse and beatings, which Simeon endured with patience. In spite of his seemingly strange behaviour, Simeon the Holy Fool healed many possessed people by his prayer, fed the hungry, preached the Gospel, and helped needy citizens of the town. Many of Simeon’s saintly deeds were done secretly.