Which preposition to use with fontaine

in Occurrences 2%

She asked me to be a good boy and an honest man, to follow the counsel of Mr. Fontaine in all things, and to keep my promise to my father.

to Occurrences 1%

" Leaving the train at Auteuil, they walked down the Rue La Fontaine to a tavern near the Rue Mozart, where the old man left Caesar in charge of the proprietor, a friend of his.

Which preposition to use with  fontaine