Note 028
See D'Anville, in the Memoires de l'Acad. des Inscriptions, tom. xxviii. p. 412 - 443. The Sclavonic name of Belgrade is mentioned in the xth century by Constantine Porphyrogenitus: the Latin appellation of Alba Graeca is used by the Franks in the beginning of the ixth, (p. 414.)
The History Of The Decline And Fall Of The Roman Empire Fall In The EastChapter 46