Fergus mac Róich
During the events of the Táin Bó Cúailnge, Ailill mac Máta takes Caladbolg away from Fergus mac Róich when he discovers Fergus' affair with his wife Medb. He gives it back when the Ulaid rally against his armies. Fergus wreaks havoc against Ulster's forces with his blade, but Conall Cernach convinces him not to kill Conchobar mac Nessa. Fergus strikes the "Three Great Strokes" on three small hills instead, blasting off their tops.