Which preposition to use with subprior

of Occurrences 2%

He died, subprior of the Abbey of St. Jean de Cartres, in 1680.

for Occurrences 1%

Some of the canons who had made themselves notorious for quarrelling and caballing were to be debarred from promotion, and were commended to the Prior and Subprior for punishment.

Which preposition to use with  subprior