The Virginity of Mary in the Magisterium of the Church
Council of Constantinople II, Fifth Ecumenical Council (553)
Canon 2  If anyone does not confess that there are two generations of
the Word of God, the one from the Father before the ages, without
time and incorporeally, the other in the last days. when the same came
down from heaven, and was incarnate of the holy and glorious Mother
of God and ever Virgin Mary, and was born of her, let such a one be
anathema.
General Council of Chalcedon (451), DS, 148; Mansi 7.462
Our Lord Jesus Christ . . . indeed born of the Father before the ages
according to divine nature, but in the last days the same born of the virgin
Mary, Mother of God according to human nature [“as was fitting for God,
He sealed her womb." The Greek has "sphragisanta." In context, it refers
to after birth. Yet that would seem to imply a belief in physical integrity
"in partu." ]
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451
553