Babylon 5 Data Files - Lorien

Lorien was the very first of the First Ones, and the very first of them to gain sentience. His race was born naturally immortal, until later generations began to age and die.
At some unspecified time Lorien settled deep in the ground on Z'ha'dum, only to be rediscovered by John Sheridan.

[@kefka1911]

He IS the first one.