Nin was an ancient Jedi Master of unknown origin who served in the Jedi Order during the last centuries of the Old Republic and served on the Jedi Council and the master of Thame Cerulian. He was a vocal opponent of the Jedi Order's alliance with tyrannical Supreme Chancellor Signet Mezzileen but he did he best to try and end the numerous protests peacefully. When Mezzileen ordered the arrest of all the Jedi and beseiged the Jedi Temple, Nin joined the battle against the Republic and was a leading member of the Jedi Coalition that was formed to combat Mezzileen.