History
Phocas
Flavius Phocas Augustus, Byzantine Emperor (reigned 602–610), called the Tyrant, usurped the throne from the Emperor Maurice, and was himself overthrown by Heraclius after losing a civil war.
Heraclius
Heraclius was a Byzantine Emperor, who ruled the Roman Empire for over thirty years, from October 5, 610 to February 11, 641. His rise to power began in 608, when he and his father successfully led a revolt against the unpopular usurper Phocas. He is also remembered for abandoning the use of Latin in official documents; further Hellenizing the Empire.
Constans II
Constans II, also called "Pogonatas," because of his thick beard, was Byzantine emperor from 641 to 668. While he was christened Flavius Heraclius, he ruled as Constantine.
Constantine IV
Sometimes incorrectly called Pogonatos, "the Bearded", by confusion with his father. He was Byzantine emperor from 668 to 685. He had been named a co-emperor with his father Constans II in 654, and became senior emperor when Constans was assassinated in 668.