Which preposition to use with praefect

of Occurrences 10%

76; C. i. 47 Libo, praefect of Pompey's fleet, C. iii. 5; converses with Caesar at Oricum, C. iii. 16; takes possession of the Island at Brundisium, C. iii. 23; threatens the partisans of Caesar, C. iii. 24; withdraws from Brundisium, ibid.

Which preposition to use with  praefect