The first kingdom of the Bulgarians may be found, under the proper dates, in the Annals of Cedrenus and Zonaras. The Byzantine materials are collected by Stritter, (Memoriae Populorum, tom. ii. pars ii. p. 441 - 647;) and the series of their kings is disposed and settled by Ducange, (Fam. Byzant. p. 305 - 318.)