Sabin, ruler (khagan) of Bulgaria, flees to the Byzantine fortress city of Mesembria, from where he escapes to Constantinople. Constantine V arranges for the transfer of Sabin's family from Bulgaria.
Abbasid Caliphate
Baghdad nears completion as up to 100,000 labourers create a circular city about 1 or 2 km in diameter (depending on the source). In the center of the "Round City" is a palace built for Caliph al-Mansur. The capital is ringed by three lines of walls (approximate date).
^Mango, Cyril; Scott, Roger (1997). The Chronicle of Theophanes Confessor. Byzantine and Near Eastern History, AD 284–813. Oxford, United Kingdom: Oxford University Press. p. 605. ISBN 0-19-822568-7.
^Winkelmann, Friedhelm; Lilie, Ralph-Johannes; et al. (2000). "Gregorios Dekapolites (#2486)". Prosopographie der mittelbyzantinischen Zeit: I. Abteilung (641–867), 2. Band: Georgios (#2183) – Leon (#4270) (in German). Walter de Gruyter. p. 531. ISBN 3-11-016672-0.