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 the order 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. See the articles in the Catholic Encyclopaedia and Wikipedia.

Proclus was a friend and disciple of St John Chrysostom. He became Archbishop of Constantinople on the death of his predecessor at Easter 434.

White is the colour of heaven. Liturgically, it is used to celebrate feasts of the Lord; Christmas and Easter, the great seasons of the Lord; and the saints. Not that you will always see white in church, because if something more splendid, such as gold, is available, that can and should be used instead. We are, after all, celebrating.