Tivoli

Tivoli was the most conquered planet in the Galaxy.

Tivoli was inhabited by a species of rodent-like humanoids. They were one of the oldest civilizations in the Galaxy, since they simply let invaders do as they wished. Their anthem was "Glory To Insert Name Here" and their cities were designed to be comfortable for the invading armies. Gibbis was a native to Tivoli. (DW: The God Complex)