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* Byzantine Emperor Heraclius invades Persia
* Muhammad ascends to heaven (according to Muslim belief)
* Suinthila succeeds Sisebut as king of the Visigoths.
The year Heraclius came to power, the Byzantine Empire was threatened on multiple fronts. Heraclius immediately had to fight the invasion of the Empire by the Sassanians who were ruled by the Persian king Khosrau Parvez.
The first battles of the campaign ended in defeat for the Byzantines; and the Persian army fought their way to the gate of Constantinople, the capital.
The Persian army attacked the city from the east while an army of Avars, Slavs, and Bulgars attacked it from the west and from the sea. However, because Constantinople was protected by a strong navy and impenetrable walls, Heraclius was able to avoid total defeat.
During its existence, the Sassanid Empire encompassed all of today's Iran, Afghanistan, Iraq, Syria, the Caucasus (Armenia, Georgia, Azerbaijan and Dagestan), southwestern Central Asia, part of Turkey, certain coastal parts of the Arabian Peninsula, the Persian Gulf area, and areas of southwestern Pakistan.
The Sassanian era, during Late Antiquity, is considered to have been one of Iran's most important and influential historical periods.
In many ways, the Sassanian period witnessed the peak of ancient Persian civilization, and constituted the last great Iranian empire before the Muslim conquest and the adoption of Islam