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Thaal Sinestro was once considered to be the greatest Green Lantern of them all, famous for establishing total peace within his space sector, 1417. He was specifically assigned by the Guardians of the Universe to mentor the new human recruit, Hal Jordan, and the two became friends. Over time however, as Sinestro became more and more stressed with his work, he started employing more questionable methods to ensure that peace was kept within his sector until he was stripped of his power ring. However, he soon replaced it with a yellow one.