This plaque, located on the western staircase of the Palace of Darius, mentions the god Mithra together with Ahura Mazda as protectors of King Artaxerxes III Ochus.
TNMM798 – CIMRM 9
Thâtiy / Artakhshatrâ khshâyathiya / imam / ustashanâm / athâganâm / mâm / upâ / mâm / kartâ.
Thâtiy / Artakhshatrâ / khshâyathiya / mâm / Auramazdâ / utâ / M[i]thra / baga / pâtuv…