Thirteenth Tribe
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Said to have been the first humans to have left Kobol, either before or at the beginning of the Great Exodus, their desination stated as the planet Earth. According to priest Elosha, "the Sacred Scrolls tell that the 13th tribe left Kobol in the early days. They travelled far and made their home upon a planet called Earth...which circled a distant and unknown star." (Mini-series)
It is possible that the Lords of Kobol travelled with the thirteenth tribe to Earth, though they were apparently still on Kobol at least until the other 12 tribes left (Home, Part II).