Tivoli
From Tardis Wiki, the free Doctor Who reference
Tivoli was the most conquered planet in the galaxy. It was inhabited by a species of rodent-like humanoids. They were one of the oldest civilisations in the galaxy and 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 of Tivoli. (TV: The God Complex)
