Context: Middle Earth Role Playing's backstory of the Witch-King of Angmar as the younger son of Tar-Ciryatan of Numenor.
Er-Murazor (A. "Black Prince") was a Numenorean Prince, the second son of King Tar-Ciryatan (Q. "Ship-Builder") and the younger brother of Tar-Atanamir the Great. He was born in the year S.A. 1820 and given the name Tindomul (Q. "Twilight Son"). Like his brother, however, he was exceptionally proud and was a fierce supporter of Numenorean interests. Fiery and given to rash aggression, Er-Murazor became embroiled in the campaigns of rapid conquest in Middle-Earth. There, he encountered Sauron and fell prey to the Dark Lord's promises of wealth, power, and immortality. Around S.A. 1998, the Dark Sorcerer accepted a Ring of Power and became the first of the nine Nazgul. He was known thereafter as the Witch-king or the Lord of Morgul.