Heraclius
October 5 610 through January 11 641

The founder of the greatest dynasty of all Byzantine rulers.  It the time of his accessession to the throne the empire was in ruins.  Through careful planning and usage of resources, Heraclius re-established the empire by 622 with the defeat of Khusru II.  He restored the Holy Cross in Jerusalem as a indication of his victory.  Through is military and financial gains, he laided the ground work for the many that came to follow him.