Which preposition to use with agostino

between Occurrences 1%

A body of armed men rode in front; then came Agnes and the Princess, with Agostino between them, while two or three troopers rode on either side; Elsie, Monica, and the servants of the Princess followed close behind, and the rear was brought up in like manner by armed men.

with Occurrences 1%

" The Superior turned to Agostino with a movement full of a generous frankness, and warmly extended his hand, at the same time fixing upon him the mesmeric glance of a pair of large, deep blue eyes, which might, on slight observation, have been mistaken for black, so great was their depth and brilliancy.

Which preposition to use with  agostino