The teaching Magisterium of the Church in Ecumenical
Councils also affirms the sacramental state of matrimony.
Lateran Council II (1139)
First defined as infallibly true that matrimony is as true a
sacrament as Eucharist and baptism.
The Council of Lyons II (1274)
Also infallibly included
matrimony among the list of seven sacraments.
The Council of Florence (1438 - 1445)
The seventh is the sacrament of matrimony which is a sign
of the close union of Christ and the Church according to the
words of the Apostle: "This is a great mystery - I mean in
reference to Christ and to the Church" (Ephesians 5:32).