What god did Paul say the Greeks ignorantly worshiped with the monument to the unknown god?

ANSWER

The LORD

Acts 17 :

(22) Paul then stood up in the meeting of the Areopagus and said: “People of Athens! I see that in every way you are very religious. (23) For as I walked around and looked carefully at your objects of worship, I even found an altar with this inscription: TO AN UNKNOWN GOD. So you are ignorant of the very thing you worship—and this is what I am going to proclaim to you.
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