Which preposition to use with propraetor

in Occurrences 3%

Left as propraetor in charge of the army, this man, in January 109, determined to try and carry off Jugurtha's treasures by a coup de main.

into Occurrences 1%

Motions were made in the senate concerning other matters; that levies should be made through all Italy; that Faustus Sylla should be sent as propraetor into Mauritania; that money should be granted to Pompey from the public treasury.

of Occurrences 1%

The first of these letters is to P. Silius Nerva, propraetor of Bithynia, a province recently added to the Empire by Pompeius.

to Occurrences 1%

2. In the beginning of the year, on a letter from Lucius Marcius being laid before the senate, they considered his achievements as most glorious; but the title of honour which he assumed (for though he was neither invested with the command by the order of the people, nor by the direction of the fathers, his letter ran in this form, "The propraetor to the senate") gave offence to a great many.

Which preposition to use with  propraetor