Grellan was a fifth-century Irish saint who lived during the era of Saint Patrick. After reportedly reviving a king's stillborn son through baptism, he was granted land in Connacht to establish a church. He eventually settled near present-day Ballinasloe, where he acted as a mediator during a conflict between the Firbolg and the Gaelic tribe of Colla da Chrioch. Through his spiritual intervention, he is credited with helping the Gaels secure the territory that became known as Uí Maine.
Life and mediation

Following his establishment of a church at Cill Cluaine, Grellan attempted to broker peace between warring factions. When a sudden attack by the Firbolg threatened the truce, Grellan prayed for divine assistance. According to legend, God responded by causing the Firbolg forces to be swallowed by the earth during the battle. This victory allowed him to grant the territory to Maine Mór and his followers.
Legacy and relics
He is the patron saint of the Ballinasloe parish and several clans, including the Kelly and Donnellan families. His crozier, a significant relic, was carried as a standard by the Uí Maine for centuries before it disappeared in the nineteenth century. Today, his name is preserved through local landmarks, a school, and a Gaelic football club in County Galway.
