The four mysteries are joyful mysteries, glorious mysteries, sorrowful mysteries and the luminous mysteries.

The Joyful Mysteries are prayed on Mondays and Saturdays, the Sorrowful Mysteries on Tuesdays and Fridays, the Glorious Mysteries on Wednesdays and Sundays, and the Luminous Mysteries on Thursdays.

After the Pax Romana there were still the same religions as before. Each ethnic group in the empire still had its own religion. Christianity was already around during the period of the Pax Romana. The Mithraic Mysteries, a cult which became popular after this period, had already reached the Roman Empire from Persia in the 1st century A.D. Manichaeism, another religion from Persia, spread around the Roman Empire after the Pax Romana

The phrase 'of mysteries' is a prepositionalphrase. The plural noun 'mysteries' is the object of the preposition 'of'.

The phrase 'of mysteries' is a prepositionalphrase. The plural noun 'mysteries' is the object of the preposition 'of'.