57 By the unrighteous judge, who fears not God, neither regards man, he means without doubt Antichrist, as he is a son of the devil and a vessel of Satan. For when he has the power, he will begin to exalt himself against God, neither in truth fearing God, nor regarding the Son of God, who is the Judge of all. And in saying that there was a widow in the city, he refers to Jerusalem itself, which is a widow indeed, forsaken of her perfect, heavenly spouse, God. She calls Him her adversary, and not her Saviour; for she does not understand that which was said by the prophet Jeremiah: “Because they obeyed not the truth, a spirit of error shall speak then to this people and to Jerusalem.” And Isaiah also to the like effect: “Forasmuch as the people refuses to drink the water of Siloam that goes softly, but chooses to have Rasin and Romeliah's son as king over you: therefore, lo, the Lord brings up upon you the water of the river, strong and full, even the king of Assyria.” By the king he means metaphorically Antichrist, as also another prophet says: “And this man shall be the peace from me, when the Assyrian shall come up into your land, and when he shall tread in your mountains.”
Source: The Antichrist (New Advent)