Islam arose as a religious and socio-political force in Arabia in the 7th century CE (610 CE onwards). The Islamic Prophet Muhammad (l. 570-632 CE), despite facing resistance and persecution, amassed a huge following and started building an empire. The tenets of this empire were to be humanitarian and its military might uncontestable. After he died in 632 CE, his friend Abu Bakr (l. 573-634 CE) laid the foundation of the Rashidun Caliphate (632-661 CE), which continued the imperial expansion. Though a feeble force at first, the Islamic Empire soon became the most important influencer in the Middle East and the Mediterranean. Within a few decades, the empire expanded from the city of Medina in Hejaz to engulf all of Arabia, Iraq, Syria, Levant, Iran, Egypt, parts of North Africa, and several islands in the Mediterranean. Internal conflict during the First Fitna (656-661 CE), or the first Islamic civil war, stagnated the empire's borders temporarily but the conquests were resumed afterward by the Umayyad Dynasty (661-750 CE).
This is a companion discussion topic for the original content at https://www.worldhistory.org/article/1571/early-muslim-conquests-622-656-ce/.