Which preposition to use with catalans

of Occurrences 1%

We think not of the millions of Frenchmen to whom the language of the capital is a sealed letter,of the Germans of Alsatia, the Flemings of the extreme North-East, the Bretons of the peninsula of Finisterre, the Basques, the Catalans of the mountains of Roussillon, and, more numerous than all these, the fourteen millions of the thirty-seven departments south of the Loire.

Which preposition to use with  catalans