What was the original rosary?

According to some Catholic traditions, the Rosary was given to Saint Dominic in a vision of the Blessed Virgin Mary and it was then promoted by Blessed Allan de la Roche. But here I read > Saint Peter Canisius, a Doctor of the Church, who is credited with > adding to the Hail Mary the sentence "Holy Mary, Mother of God, pray > for us sinners", ... which means it wasn't part of the original rosary. What was the exact form of the original rosary given by Blessed Virgin Mary and who added **"now and the hour of our death"**?