SINESTRO first appeared in GREEN LANTERN #7 (1961). He proved to be a very popular villain for GREEN LANTERN and appeared quite often in not only GREEN LANTERN but other DC COMICS titles as well! Sinestro was born on the planet Korugar in space sector 1417. His dedication to preserving order originally manifested in his previous career, an anthropologist specializing in reconstructions of ruins of long-dead civilizations. He received his ring when Sinestro was born on the planet Korugar in space sector 1417. His dedication was towards the reconstructions of ruins of long-dead civilizations. He received his ring when Prohl Gosgotha a GREEN LANTERN crash-landed on the site SINESTRO was working on and died! It turns out his sister was the wife of Aben Sur! When Hal Jordan joined the Green Lantern Corps, Sinestro was assigned to be his instructor. For using the power of the Green Lantern to instill fear rather than combat it, the Guardians banished Sinestro. That was the beginning of his turning renegade! The scientists known as the Weaponers of Qward, fashioned a a yellow power ring for Sinestro to use since GREEN LANTERN's "Power Rings" possess an impurity that is a weakness in their rings that preventing them from directly affecting anything that has the color yellow in it! He lately established a 'SINESTRO CORPS' and has proven himself from time to time to still have a heart! This makes him an ANTI-HERO!