Adar

Adar, or "Lord-father" half elf half orc nammed as "Ukuk" from the ring of power series .
He was one of the Moriondor, the thirteen Elves chosen to be corrupted by Morgoth in the Elder Days. Lured by the promise of power, he was led up a dark, nameless peak, chained and abandoned to hunger and thirst. Sauron eventually appeared and offered him red wine. He drank the wine, forever changing his nature.
His nature was later perceived by Galadriel after she briefly captured him in the Second Age.
Subsequent generations of the newly bred race of Orcs considered him to be their "father", and followed him willingl