Contradiction with Luke 8:35
This verse recounts the same story as Mark 5:15 but confirms the events, hence it does not directly contradict Mark 5:15—it supports it. This illustrates the complexity of finding true contradictions in separate gospel accounts.
Luke 8:35: Then they went out to see what was done; and came to Jesus, and found the man, out of whom the devils were departed, sitting at the feet of Jesus, clothed, and in his right mind: and they were afraid.