What event marks the start of the Islamic calendar? Ramadan
Muhammad’s revelation
the Hijrah
Muhammad’s return to Mecca

Hijrah

Explanation:

Daily fact : Islam is an Abrahamic monotheistic religion teaching that Muhammad is a messenger of God. It is the world's second-largest religion with 1.9 billion followers, or 24.9% of the world's population, known as Muslims. Muslims make up a majority of the population in 47 countries.

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in 476 c.e. romulus, the last of the roman emperors in the west, was overthrown by the germanic leader odoacer, who became the first barbarian to rule in rome. the order that the roman empire had brought to western europe for 1000 years was no more.

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