Raymond of Peñafort

From Universalis.com:

He was born near Barcelona somewhere between 1175 and 1180. He was educated at the University of Barcelona, where he taught canon law for fifteen years. After a spell at the University of Bologna he returned to Barcelona in 1222 and became a Dominican. At the command of Pope Gregory IX he organised, codified and edited canon law, which, when he started, was nothing better than a chaotic accumulation of isolated decrees. He was elected to be General of the Dominicans and gave it an excellent set of regulations for its better governance. He died in 1275. Among his works, the Summa casuum is noteworthy. This gives guidance as to how the sacrament of Penance may be administered justly and with benefit to the penitent.