section_path: History/Late antiquity and the medieval period
section_name: Late antiquity and the medieval period
paragraph_text: Late antiquity and the medieval period
  
  Early Christianity displaced Roman paganism in the 4th century CE, with Constantine embracing and promoting the Christian religion and Theodosius I making it the state religion. A series of laws were passed that discriminated against Jews and Judaism, and Jews were persecuted by both the church and the authorities. Many Jews had emigrated to flourishing Diaspora communities, while locally there was both Christian immigration and local conversion. By the middle of the 5th century, there was a Christian majority. Towards the end of the 5th century, Samaritan revolts erupted, continuing until the late 6th century and resulting in a large decrease in the Samaritan population. After the Sasanian conquest of Jerusalem and the short-lived Jewish revolt against Heraclius in 614 CE, the Byzantine Empire reconsolidated control of the area in 628.
  
  In 634–641 CE, the Rashidun Caliphate conquered the Levant. Over the next six centuries, control of the region transferred between the Umayyad, Abbasid, Fatimid caliphates, and subsequently the Seljuks and Ayyubid dynasties. The population drastically decreased during the following several centuries, dropping from an estimated 1 million during Roman and Byzantine periods to about 300,000 by the early Ottoman period, and there was a steady process of Arabization and Islamization. The end of the 11th century brought the Crusades, papally -sanctioned incursions of Christian crusaders intent on wresting Jerusalem and the Holy Land from Muslim control and establishing Crusader States. The Ayyubids pushed back the crusaders before Muslim rule was fully restored by the Mamluk sultans of Egypt in 1291.