The name of Estonia (Estonian: Eesti [ˈeˑstʲi] ) has a long and complex history. It has been connected to Aesti, first mentioned by Tacitus around AD 98. The name's modern geographical meaning comes from Eistland, Estia and Hestia in the medieval Scandinavian sources. Estonians adopted it as an endonym only in the mid-19th century.