Which preposition to use with coevals

with Occurrences 67%

The smaller open cisterns, in which the water is thick and covered with slime, are of Musalman origin, but there are one or two in other parts of the hill which clearly date from Buddhist ages and are coeval with the rock-cells.

in Occurrences 1%

Even while among the living, men looked upon them with awe,feeling, that, though coeval in time, infinite space rolled between.

of Occurrences 1%

Somewhere on the bounds of the dim ocean-world we know that there is an exiled court, a faded sort of St. Germain celestial dynasty, geologic gods, coevals of the old Silurian strata,to wit, Kronos, Rhea, Nox, et al.

Which preposition to use with  coevals