Which preposition to use with vilayets

of Occurrences 19%

Although the population of the whole vilayet of Audin and the majority of the Sanjak of Smyrna was Mussulman, Greece had the possession.

to Occurrences 1%

The vilayet of Adrianople roughly corresponds to Thrace, the Adriatic vilayets to Epirus, and the intervening territory to Macedonia.

Which preposition to use with  vilayets