Which preposition to use with barbin

in Occurrences 1%

The first victims of this sweeping accusation were the Baron de Persan, the brother-in-law of De Vitry, and De Bournonville his brother, who were entrusted with the safe keeping of Barbin in the Bastille, and by whom he had been indirectly permitted to maintain a correspondence with his exiled mistress; together with the brothers Siti, of Florence, and Durand, the composer of the King's ballets.

Which preposition to use with  barbin