Sinestro is a native of Korugar, a planet in space sector 1417. Sinestro's dedication to preserving order initially led him to be considered one of the greatest Green Lanterns evaaa! As time passed, Sinestro grew in his fixation to not simply protect his space sector, but began obsessing on preserving order in the society of Korugar his home planet, at increasingly acceptable costs. Eventually he concluded that the best way to accomplish order was to conquer his home plane and to rule as a dictator. Sinestro as a member of the Green Lantern Corps. When Hal Jordan joined the Corps, Sinestro was assigned as Hal's instructor. Jordan was appalled at Sinestro's fascistic methods, though Sinestro maintained that his iron-fisted rule was necessary to protect his people from alien forces. During his training, Jordan helped Sinestro repel an attempted invasion of Korugar by the alien warlords known as the Khunds. When Jordan called for help from the other Green Lanterns, Sinestro's dictatorship was exposed and he was forced to appear before the Guardians for punishment.