Career
Connellan was a harper, who may or may not have composed the tune Caoineach Luimnigh (the lament for Limerick). He was well known in Scotland, where he travelled extensively. There his version of Luimnigh became Lochabar Number More.
He is also credited with Love"s A Tormenting Pain, and probably Killiecrankie.
Arthur O"Neill (1734-1818) refers to William in his memoirs:
He died in the county of Waterford.