The Quinisext Ecumenical Council
Held in Constantinople in 692. In the dome of the Imperial Palace, the "In Trullo" (dome) Council, from which it derives the name: "Trullan" Council.
It is regarded as supplementing the Fifth and the Sixth Ecumenical Councils, hence, it is called "Quinisext." Its work was purely legislative, it ratified 102 canons and the decisions of the previous Ecumenical Councils.
Doctrinal and Disciplinary Canons
Sanctioned the so-called "Eighty-five Apostolic Canons" and approved the disciplinary decisions (Canons) of certain regional Councils. The Council added a series of disciplinary decisions or canons to the existing ones. The "Quinisext" Council laid the foundation for the Orthodox Canon Law.