Which preposition to use with demetri

with Occurrences 1%

While Day and Hooper, of the ex-motor party, had turned back on November 24, and Meares and Demetri with the dogs ascended above the Lower Glacier Depot before returning on December 11, the Southern Party and its supports were organised successively as follows: December 10, leaving Shambles Camp Sledge 1.

Which preposition to use with  demetri