Compared to his long tenure , the reigns of his successors Constantine , Alexander , George II proved short and insecure .
During the First Balkan War , after Greek troops had captured much of Greek Macedonia , George was assassinated in Thessaloniki .
Compared to George 's long tenure , the reigns of George 's successors Constantine , Alexander George   II proved short and insecure .
During the First Balkan War , after Greek troops had captured much of Greek Macedonia , George was assassinated in Thessaloniki .