Throw light on the main achievement of the early four caliphs?

1.	Throw light on the main achievement of the early four caliphs?
Answer» The Four Caliphs were the first four leaders of Islam that succeeded the Prophet Muhammad. They are sometimes called the "Rightly Guided" Caliphs because each of them learned about Islam directly from Muhammad. They also served as Muhammad\'s closest friends and advisors during the early years of Islam.

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