Make that seven ecumenical, or church-widecouncils.
Revisionism.
Dr. E called my comment "Revisionism." That reminds me of the replies made by Bolsheviks. Anything they didn't like or know was "revisionism" (their term).
Of course, the only Councils that are binding are Ecumenical or General or Church-wide Councils, and only they can set dogma.
Unlike the Council of Orange, the Council of Trent is considered an Ecumenical Council by the Latin Church (technically speaking the East was invited but did not attend).
The same can be said of the Third African Council (Council of Carthage) at the end of the 4th century, that established the Christian canon. It was a western council and not binding to the East, which is why the east was under no obligation to accept the book of Revelation as canonical, and in fact did not do so until the 9th century.