Which preposition to use with graveside

in Occurrences 1%

At the graveside in Père Lachaise, Eugène and Christophe were the only mourners; Bianchon's duties detained him at the hospital.

of Occurrences 1%

He was standing by the graveside of a departed friend and observed that one of the mourners, a fellowlawyer, was shedding real tears.

Which preposition to use with  graveside