Depending on what country you live in, today may be a first class feast, and thus a day off Lenten discipline!
The saint being honoured is, of course, St Patrick (c387-493).
St Patrick was captured by Irish pirates at the age of 16, and forced to work as a slave. After several years, he managed to escape and return home. He then entered the Church and became a missionary bishop to the land in which he had been held captive.