taken by the Saracens, [163];
taken by the Crusaders, [265]
John I. (Zimisces), murders his uncle, [232];
successful wars of, [234-7];
dies, [239]
John II. (Comnenus), reign and conquests of, [268-9]
John III. (Ducas Vatatzes), [300];
conquers Thrace and Macedonia, [301]