The following pages demonstrate the Quinisext Council, known more commonly as “Trullo,” was accepted by the Western Church as part of the fifth and sixth ecumenical councils and its canons carried the same weight and authority as those from other ecumenical councils in both the East and the West.
The source is Nicolae Dura, “The Ecumenicity of the Council of Trullo, Witness of the Canonical Tradition in East and West,” in George Nedungatt and Michael Featherstone, eds. The Council of Trullo Revisited (Rome 1995). pgs. 229-262