His biography itself is larger than life - son of Romans living in late 4th century Britain, he was kidnapped by pirates, sold into slavery in Ireland, learned the native culture, and escaped quite a few years later. He traveled from Britain to Gaul, where he studied to become a priest, and was eventually sent on a mission back to Ireland as a bishop.
His legendary deeds are even more amazing. In numerous showdowns with the pagan druids or in audience with the Irish kings, he's attributed with amazing feats like flinging opponents (magically) up into the air, building unquenchable fires, creating food and water, raising the dead, healing the sick, causing enemies to be swallowed whole by the earth, controlling the weather, and even shape changing he and his men into deer(!). In addition to contests with the druids, there are stories that involve confrontations with demons and showdowns with pagan gods themselves, like Crom Dubh and the 11 idols*.
St Patrick in a D&D Game
I like the idea of having legendary figures like St Patrick in the campaign setting, and certainly would like to build a similar figure for the church of Pholtus or the Eternal Spirit in Gothic Greyhawk - like an early champion of the faith that carried the church's beliefs south from the Theocracy of the Pale towards places like Keoland when they were still pagan and Suel. Powerful legendary figures like St Patrick left behind a wealth of places and items that gained mythic significance in the ensuing centuries; pilgrimage sites like the mountain of Croagh Patrick, or his burial site at Down Patrick, or the various churches and monasteries erected at places where the saint is attributed with performing great deeds. There are relics, like the bell of St Patrick, and the lasting symbols, like the Celtic cross and the shamrock. (Granted, the shamrock likely had pagan significance as well, but it's been long since preempted).
When building this kind of mythic figure for a game, here is a short list that comes to mind when placing churches, monasteries and shrines:
- Great battle sites
- Sites of miracles
- The saint's burial site
- Location of relics
- Famous artifacts related to the saint
- Feasts and festivals that persisted to the modern day
- Founder of a clerical order
*For a neat movie with Crom and medieval Irish Christianity, check out last year's excellent animated feature The Secret of Kells - about the making of the book of the Kells.