The first ecumenical council was held in Nicaea in 325. 
    The second ecumenical council was held in Constantinople in 381.
    The third ecumenical council was held in Ephesus in 431. 
    The fourth ecumenical council was held in Chalcedon in 451. 
    The fifth ecumenical council was held in Constantinople in 553. 
    The sixth ecumenical council was held in Constantinople in 680.  
    The seventh ecumenical council was held in Nicaea in 787. 

There have been 7 ecumenical councils in total. The first four were called into being by the Roman Emperor Constantine I and were focused on theological issues such as Arianism, which is a Christian belief that Jesus Christ is subordinate to God the Father and not equal in power or eternity. The next three (the Fifth, Sixth, and Seventh) were called into being by the Byzantine Empire’s Justinian I and his successors.
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