Granicus

Granicus was the name of an Imperial throneworld, in the Granicus system, a gas giant with gray cirrus methane clouds. The galactic capital was a floating city.

Prior to 20 BBY, C-3PO served as one of 1,200 interpreter droids at the sub-embassies in the Granicus system, assigned to a "third liaison officer" He served as an interpreter for 37 years before he was eventually redesignated a protocol droid and sent to the Outlands to help welcome new systems into the Old Republic.

Text and facts from the “Granicus” article on Wookieepedia, licensed under CC BY-SA 3.0. Modified for this site.