Crowned Caesar Flavius Heraclius Augustus in 610. Latin was still the official language of the military and government. The Emperor faced invasions by Persians, Avars, Spanish Visigoths and Muslim Arabs. The Emperor personally commanded Roman troops in an invasion into the heart of Persia. He crushed their Empire and forced Persian troops to evacuate the conquered Roman provinces of Egypt, Palestine, Syria and Mesopotamia.
For more go to Part X of my series on the titanic Battle for the Middle East.
Where Eastern Roman military history is addressed at all there are casual references to a single Battle of Yarmouk in 636 AD. "Historians" effectively say the Arabs just magically showed up one day at Yarmouk and defeated a weak Roman Empire.
Nothing could be further from the truth. My series details a Roman-Muslim slug fest taking place over many years and many battles over a huge geographical area.
(Sasanian Egypt) (Sasanian conquest of Egypt) (Babylon fortress)