Curta, p. 66. «They were first given land in the province of Thessalonica, but no such theme existed during Heraclius’ reign. Emperor Constantine’s explanation of the ethnic name of the Serbs as derived from servi is plainly wrong». (EN) Florin Curta, The Making of the Slavs: History and Archaeology of the Lower Danube Region, c. 500–700, Cambridge, Cambridge University Press, 2001.
