Karhammur was the Emperor of the Klingon Empire in the mid-22nd century. In 2190 SFC he began carrying out plans to expand the Empire into Federation space, eventually leading to the start of the Four Years War on stardate 1/9409. In 2198 SFC, he was forced to abdicate the throne in favor of his son Kassa soon after the war ended. (FASA RPG module: The Four Years War)