Molaise of Leighlin was a 6th and 7th-century Irish saint who served as an abbot and bishop. Born in Leinster, he spent time in Scotland as a hermit on Holy Isle before traveling to Rome, where Pope Gregory I ordained him. He eventually returned to Ireland to lead the monastery at Old Leighlin, where he worked to align local church practices with Roman traditions, including the method for calculating Easter. He is also known by the name Laserian in Irish traditions.