Clothar V is a planet in the Clotharian Galaxy. It exact location in relation to Earth is unknown, but it is described as being "billions of miles away". It is home the the Clotharian Rebel Fleet, and was formerly ruled by the Pentarchs of Clothar, before they were captured and sentenced to exile on Earth.
They signed the Treaty of Periperpagilium, despite protestations by Aldwin. ("The Boyband Superfan Interrogation")