Who / what is the "mighty god" (in Daniel 11:36-38)

Who / what is the "mighty god" (in Daniel 11:36-38) that the ruler's fathers had not worshiped as a god?

Daniel 11:36-38... “Then the king shall do according to his own will: he shall exalt and magnify himself above every god, shall speak blasphemies against the God of gods, and shall prosper till the wrath has been accomplished; for what has been determined shall be done. He shall regard neither the gods of his fathers nor the desire (gods) of women, nor regard any god; for he shall exalt himself above them all. And for his position he will honor this mighty god (of self-will and self exaltation), and a god that his fathers had not known, he shall honor with gold and with silver and with precious stones and with lust.

Clues: to do one's own will ; to serve, exalt, and magnify oneself