Easton's Bible Dictionary (1897)
Cush of double wickedness, or governor of two presidencies, the king of Mesopotamia who oppressed Israel in the generation immediately following Joshua (Judg. 3:8). , “Mesopotamia”) more than once, long before the Exodus, and that at the time they were written the king of Aram-naharaim was still intriguing in Canaan. It is mentioned among the countries which took part in the attack upon Egypt in the reign of Rameses III. (of the Twentieth Dynasty), but as its king is not one of the princes stated to have been conquered by the Pharaoh, it would seem that he did not actually enter Egypt.
As the reign of Rameses III. corresponds with the Israelitish occupation of Canaan, it is probable that the Egyptian monuments refer to the oppression of the Israelites by Chushan-rishathaim. Canaan was still regarded as a province of Egypt, so that, in attacking it Chushan-rishathaim would have been considered to be attacking Egypt.
Hastings' Dictionary of the Bible (1898) & Schaff's Bible Dictionary
CHU'SHAN-RISHATHA'IM. Jud 3:8-10. A king of Mesopotamia, and an oppressor of the Israelites. Othniel, Caleb's nephew, delivered them from his dominion.
Hitchcock's Bible Names (1869)
blackness of iniquities