St. Liborius was bishop of Le Mans (348-397), where he labored with signal success. He is said to have healed sufferers from "gravel and allied complaints," and for this reason his feast was introduced by Pope Clement XI, himself a victim who was cured through the saint's intercession. The earliest historical reference dates to the ninth century when his remains were transferred to Paderborn, Westphalia, to aid in the conversion of the Saxons; they are still there at present.
http://www.catholicculture.org/culture/liturgicalyear/calendar/day.cfm?date=2014-07-23