The Sub Tuum Praesidium is the most ancient of all Marian Hymns, dating back to the fourth century. It addresses Our Lady as Mother of God (Theotokos) a century before the definition of the same at the Council of Ephesus.
In English it reads:
We fly to Thy protection / O Holy Mother of God; / Do not despise our petitions in our necessities / but deliver us always from all dangers / O Glorious and Blessed Virgin. Amen
VaticanNews: The following is the full text of a comuniqué released on Saturday by the Holy See’s Press Office regarding an invitation extended by Pope Francis to all the faithful to join in praying the Rosary during the month of October: Read here.