Arin Sur was a female inhabitant of the planet Ungara and was the sister of the famous Green Lantern Corps member Abin Sur. During her brothers time as a Green Lantern, she met and fell in love with Sinestro. During the War of Light, when Sinestro took loyal Sinestro Corpsmen to attack Zamaron to free the female members of their group. These women were being placed in conversion crystals that was brainwashing them to become new recruits of the Star Sapphire Corps. At the time, Sinestro battled against Carol Ferris and she imprisoned him within a conversion crystal which brought back memories of Arin Sur. However, he managed to break free from the crystal and continued with his attack.