Which preposition to use with tumulus

of Occurrences 9%

The fragment of a wall or plinth, covered with rank creepers, an archway of which the stones are sagging into final disruption, and many a tumulus of coarse brown grass are all that remain of the wide buildings which once surrounded the Ambarkhana.

near Occurrences 3%

The tumulus near Mersyn, the port of Tarsus, was plainly visible.

in Occurrences 1%

I have always thought that the tumulus in your field might yield some interesting archaeological find.

Which preposition to use with  tumulus