פירוש על עבודה זרה 99:8

Yannai (Alexander Yannai) was a Hasmonean king who ruled between 103-76 B.C.E. According to this source, when his palace was destroyed, the Romans turned it into a palace for Mercurius. Then other idolaters came, conquered the place and did not worship Mercurius, so they used the stones to pave the ground. Thus we have stones that were once part of idols now being used to pave roads. Can a Jew walk there? Have they been annulled? Some rabbis did, and others did not.
As far as the historicity of this story goes, there may be some echo here of the fact that Israel was placed between the two great powers, the Seleucids in the north and the Ptolemies in the South. The rulers of Israel often found themselves caught between these two powers. I do not know if one of these powers worshipped Mercury while the other did not.