The Holy Rosary goes all the way back to when Our Lady gave it to St. Dominic
in the structure and totality that she wanted us to pray.
Answered on October 21st
A. How many Mysteries did she give him?
Answer: Fifteen
B. In what year did this take place?
Answer: 1214 A.D.
(This year is given to us by St. Louis de Montfort, who based his information on centuries-old, reliable Catholic resources.)