Second Council of Constantinople (553), anathema 2 — the 'ever-virgin' Mary — English translation from Norman P. Tanner (ed.), Decrees of the Ecumenical Councils, as posted at papalencyclicals.net (official text, quoted at the cited paragraph)
Anathema 2:
If anyone will not confess that the Word of God has two nativities, that which is before all ages from the Father, outside time and without a body, and secondly that nativity of these latter days when the Word of God came down from the heavens and was made flesh of holy and glorious Mary, mother of God and ever-virgin, and was born from her: let him be anathema.
Anathema 6:
If anyone declares that it can be only inexactly and not truly said that the holy and glorious ever-virgin Mary is the mother of God, or says that she is so only in some relative way, considering that she bore a mere man and that God the Word was not made into human flesh in her, holding rather that the nativity of a man from her was referred, as they say, to God the Word as he was with the man who came into being; if anyone misrepresents the holy synod of Chalcedon, alleging that it claimed that the virgin was the mother of God only according to that heretical understanding which the blasphemous Theodore put forward; or if anyone says that she is the mother of a man or the Christ-bearer, that is the mother of Christ, suggesting that Christ is not God; and does not formally confess that she is properly and truly the mother of God, because he who before all ages was born of the Father, God the Word, has been made into human flesh in these latter days and has been born to her, and it was in this religious understanding that the holy synod of Chalcedon formally stated its belief that she was the mother of God: let him be anathema.
This text is under copyright; the cited paragraph is quoted for study, with a link to the full document. Translation: English translation from Norman P. Tanner (ed.), Decrees of the Ecumenical Councils, as posted at papalencyclicals.net.
Why Pitre cites it
The council's anathemas speak of 'the holy, glorious Mother of God and ever-virgin Mary' — the official title Aeiparthenos.
Notes
Anathema 2 reads "made flesh of holy and glorious Mary, mother of God and ever-virgin" (word order differs slightly from the requested phrase "the holy, glorious, mother of God and ever-virgin Mary"). Anathema 6 ("the holy and glorious ever-virgin Mary is the mother of God") is also included since it is the council's fullest statement on the title. The labels "Anathema 2/6" are editorial.