Kaiyan

Kaiyan, also known as the planet vegeta's first immortal being or the saiyan's first immortal man, was a a very powerful Saiyan of the Saiyan subculture. Kaiyan became one of the world's first immortal being, the oldest known ancestor of the Goku's family or bloodline.

In recent times, Kaiyan was junheard of due to being alive so long ago

Origin
Kaiyan was a young, gifted and powerful saiyan who was a part of a group of very gifted saiyans called The Barbaric Saiyans. Kaiyan was one of the most powerful saiyans amongst the group who desired immortality, wanting to live for eternity, and wanted to create a spell for immortality. Kaiyan worked for a powerful saiyan named Veggie (who would become the oldest known ancestor of the Vegeta bloodline), who was one of the most powerful Saiyan in history and was also his best friend since childhood.

But with a unhappy life and was sold into slavery. This trauma ultimately drove him insane, and paved his way into becoming one of the world's most ruthless mercenaries. as Kaiyan was the personal factotum to Veggie.

Wanting revenge on Veggie he would escape and learn to strengthen his base form to survive as a stray saiyan. It was at this time that Kaiyan had wished for immortality via the saiyan planets dragon ball and had become the world's very first immortal being. Kaiyan then tracked Veggie down and was strongly enraged and deeply hurt about his treatment as slave due to being a low class warrior. Out of revenge, he found Veggie, petrified him and killed him. However, Kaiyan, being the brilliant and intelligent person he is, but bored, he chose to desiccate and starve in darkness forever instead, For two millenniums, Kaiyan had lain buried, awaiting the day when someone would find him and free him from his tomb.