Kaikielius/Legends

Kaikielius was a planet in the Core Worlds, situated on the Koros Trunk Line between Foerost and Ruan, just outside of the Deep Core. It was attacked by Imperial forces in 10 ABY, and this battle, along with a simultaneous strike against Metellos, persuaded the leaders of the New Republic that they could not hold the capital on Coruscant.

Soon after, commanders loyal to the Imperial Ruling Council did indeed stage their dramatic recapture of Coruscant. Indeed, the strike on Kaikielius is likely to have been part of a concerted thrust against the capital by these forces, although there is no explicit evidence to confirm this.