Moses
Deuteronomy 3:11ESV·traditional attribution

(For only Og the king of Bashan was left of the remnant of the Rephaim. Behold, his bed was a bed of iron. Is it not in Rabbah of the Ammonites? Nine cubits was its length, and four cubits its breadth, according to the common cubit.)

Matthew Henry Presbyterian @wholebiblehenry

We have here another brave country delivered into the hand of Israel, that of Bashan; the conquest of Sihon is often mentioned together with that of Og, to the praise of God, the rather because in these Israel's triumphs began, Psa 135:11; Psa 136:19, Psa 136:20. See, I. How they got the mastery of Og, a very formidable prince, 1.

Commenting on Deuteronomy 3:1-11

John Gill Reformed Baptist @doctorgill

For only Og king of Bashan remained of the remnant of giants,.... The meaning seems to be, either that he was the only one that was left of the race of the giants the Ammonites found when they took possession of this country, Deu 2:20 or that was left when the Amorites took it from the Ammonites; and who having by some means or other...

Jamieson-Fausset-Brown Reformed @jfbcommentary

only Og king of Bashan remained of the remnant of giants--literally, "of Rephaim." He was not the last giant, but the only living remnant in the trans-jordanic country (Jos 15:14), of a certain gigantic race, supposed to be the most ancient inhabitants of Palestine.