umar was the most powerful of the four Rashidun Caliphs and one of the most powerful and influential Muslim rulers. He was a sahaba of prophet muhammed (PBUH).He was the second Caliph of Rashidun Caliphate on 23 August 634. He was an expert jurist and is best known for his justice with Muslims and non-Muslim subjects alike, that earned him the title Al-Farooq (The one who distinguishes between good and bad) and his house as Darul Adal (house of justice). also, Omar was the first Caliph to be called (Amir al-Mu'minin; Commander of the Faithful).
Under Umar the Islamic empire expanded at an unprecedented rate annexing the whole Sassanid Persian Empire and more than two thirds of the Eastern Roman Empire. His legislative abilities, his firm political and administrative control over a rapidly expanding empire and his brilliantly coordinated multi-prong attacks against Sassanid Persian Empire that resulted in conquest of Persian empire in less then two years, marked his reputation as a great political and military leader. It was Umar who for the first time in 500 years since expulsion of Jews from the Holy Land, allowed them to practice their religion freely and live in Jerusalem.

Religiously a controversial figure in the Muslim world, Umar is regarded Ahl Sunnah as one of four Rashidun or rightly guided caliphs who were true successors of Muhammad; in stark contrast, regarded by the Raafidah as unjust in his usurpation of Ali's right to the caliphate, indeed as the principal political architect of opposition to Ali. According to the Raafidah, Fatimah, wife of Ali and daughter of Muhammad, was abused by him and it is believed the event caused her to miscarry her child and eventually led to her death soon after. But obviously these are all lies.

May Allah unite us with Umar(ra) in Jannah Ameen.

Akhee, I changed your post slightly hope you don't mind.