Which preposition to use with gregoire

with Occurrences 2%

One morning Mathieu, wishing to ascertain if the young coveys of partridges were plentiful in the direction of Mareuil, took Gregoire with him; and when they found themselves alone among the plantations of the plateau, he began to talk to him seriously.

at Occurrences 1%

Things took a similar course with respect to the mill, where Gregoire at first contented himself with repairing the old mechanism, for he was unwilling to upset the miller's habits all at once, and therefore postponed until some future time the installation of an engine, and the laying down of a line of rails to Janville stationall those ideas formerly propounded by Mathieu which henceforth fermented in his audacious young mind.

Which preposition to use with  gregoire