THERE are a few rulers in the world who have left indelible impressions in history. Caliph Umar bin Abdul Aziz tops that list. He is considered one of the finest rulers in Muslim history, second only to the four rightly guided caliphs — Abu Bakr, Umar, Uthman and Ali (RA). In fact, in some circles, he is affectionately referred to as the fifth and the last caliph of Islam.   Umar bin Abdul Aziz ruled as a caliph for only 30 months but during this short period, he changed the world. His tenure was the brightest period in the 92-year history of the Umayyad Caliphate. He was the son of Abdul Aziz bin Marwan, the governor of Egypt while his mother, Umm-i-Aasim was the granddaughter of Caliph Umar Ibn Al Khattab.   Umar died in Rajab 101 AH at the age of 38 in a rented house at the place called Dair Sim’aan near Homs. He was buried in Dair Sim’aan on a piece of land he had purchased from a Christian. He reportedly left behind only 17 dinars with a will that out of this amount the rent of the house in which he died and the price of the land in which he was buried would be paid. And thus departed the great soul from the world. May Almighty Allah rest his soul in peace and award him the best place in Paradise.