The number of forts discovered exceeds the number recorded in the sources (11 centres of Moravians and 30 centres of "other Moravians" or "Merehanos"; opinions differ as to how to interpret the reference to "Merehanos"). Though the only castles which are mentioned by name in written texts are "Nitrawa" (828; identified with Nitra), "Dowina" (864; sometimes identified with Devín Castle) and perhaps "Brezalauspurc" (907; sometimes identified with Bratislava Castle), some sources claim that Uzhhorod in Ukraine (903) was also a Moravian fortress. Devín Castle is sometimes identified with a "fortress of Prince Rastislav" mentioned in the "Annales Fuldenses".