Which preposition to use with xvi

In Occurrences 4%

The Cabin of the Namur XVI In Dorothy's Stateroom XVII

OF Occurrences 2%

THEY BRAKE OPE THE DUNGEON OF BELSAYE XIV HOW BELTANE CAME NIGH TO DEATH XV HOW BELTANE HAD WORD WITH PERTOLEPE THE RED, AND HOW THEY LEFT HIM IN THE FOREST XVI OF THE RUEFUL KNIGHT OF THE BURNING HEART XVII OF THE AMBUSHMENT

Which preposition to use with  xvi