Medieval Christians said the rosary as Catholics still do today: by praying five decades of Ave Marias (Hail Marys), each introduced by a Pater Noster (Our Father), while meditating on three series of five mysteries each.
The rosary is an instrument of fasting that was invented by modern Christians.
( z1 instrument :instrument-of ( z2 fasten ) :domain ( z3 rosary ) :ARG1-of ( z4 invent :ARG0 ( z5 person :mod ( z6 religious-group :name ( z7 name :op "Christian" ) ) :mod ( z8 modern ) ) ) )