Explanation

Ameer Muawiyah (R.A) was the founder and first caliph of the Umayyad Caliphate

He was serving from 661 until his death.

 He became caliph less than thirty years after the death of the Islamic prophet Muhammad

He was appointed as the Governor of Syria after his brother, Yazid ibn Abu Sufyan, died

Ameer Muawiyah (R.A) established the Postal System