A well-respected chap, he’s best known for his letter to Roman bigwig Marcus Aurelius expounding Christian Apologetics. ("Sorry — but I don’t agree with this Montanism doctrine. I’m sorry but I really don’t.")
As luck would have it, a legion of Roman soldiers almost drowned in the desert after being targeted by a miraculous rainstorm. But Christian prayer saved them from this embarrassing fate and the entire legion turned Godwards.
This was obviously a home run for the Christians. So Marcus Aurelius held fire on his persecutions for a bit.