After the group of Vulcan opportunists left Vulcan during Surak's revolution of logic and reason 2,000 years ago, they had to walk a long way in search of a new home. Decades, probably even centuries, they crossed interstellar space with their primitive, not warp-propelled ships, and settled  or conquered numerous planets. In the Kaleb sector, the Taugus sector and adjoining areas of space near the later Romulan Neutral Zone and the Klingon Empire, still today the remains of these ancient Romulan colonies can be found, e.g. on Yadalla Prime, Calder II, Dessica II, Draken IV. While these planets were formerly uninhabited, the Romulans discovered in the same sectors planets like Barradas III, which were outposts of another space-travelling cilivisation - the Debrune. Either in peaceful co-existance, but most probably by subjugation of the other culture, the Romulans settled there as well, leading to a cross-breeding and mixture of both species. A few Debrune hereditary factors were integrated into the dominant Romulan DNA. The Debrune-Romulan hybrides had a slightly different skin color and a charasteristic forehead, separating them from the "Vulcan Romulans". The Romulans finally left the planets in those sectors and moved to Romulus and Remus, two planets which became their final home, located about 50 lightyears away from Vulcan. Although the Debrune-Romulans were in the majority, two Romulan races kept on existing. Consequently, a Vulcan does not stand out on Romulus, since he is regarded as a "Vulcan Romulan".