Diarmuid Ua Duibhne
Lancer is better known as Diarmuid Ua Duibhne. He plays a part of the Fourth Holy Grail War as the Servant class Lancer. He only wishes to serve his master well and do his best. He also respects Saber as she does him.
In history, he was the son of Donn. His father was a foster child of Aengus Og which was Fianna’s first warrior of the knights. He has a ‘love spot’ that was granted to him from a girl and is known as Diarmuid of the Love Spot due to this. Any girl who gazes upon that spot, falls in love with him. It just so happened that the bride of Fionn mac Cumhaill, Grainne, fell in love with Diarmuid. They ran away from her wedding party and Fionn began to chase after them.
Fionn finally recognized their marriage and welcomed them back with a proper title and land. Diarmuid died after being fatally wounded by a wild boar. Fionn was with him. Fionn had an ability to turn spring water into a healing elixir, but ‘spilled’ the water twice while attempting to get it. By the time he reached Diarmuid, he was dead.