The Byzantines were able to regain control of the country after a brief Sasanian Persian invasion early in the 7th century amidst the Byzantine–Sasanian War of 602–628 during which they established a new short-lived province for ten years known as Sasanian Egypt, until 639–42, when Egypt was invaded and conquered by the Islamic Empire by the Muslim Arabs. When they defeated the Byzantine Armies in Egypt, the Arabs brought Sunni Islam to the country. Early in this period, Egyptians began to blend their new faith with indigenous beliefs and practices, leading to various Sufi orders that have flourished to this day. These earlier rites had survived the period of Coptic Christianity.
What war gave Sasanin Persians control of Egypt?
Byzantine–Sasanian War of 602–628