During the Easter vigil in the cathedral of Milan in the year 387, the bishop (known to posterity as St Ambrose of Milan‎) baptised several people. Among them were a 33 year old man and his illegitimate teenage son. The man eventually moved back to his homeland. That man was St Augustine of Hippo. And the above photo is the baptistry in which he and his son Theodatus received the laver of regeneration. http://flic.kr/p/q4hcLt