The kings of the earth— Jerusalem was so strongly fortified both by art and nature, and had been so often miraculously preserved by God from the attempts of its enemies, that it seemed almost incredible that it should suffer so total a subversion. See Calmet.
Related Commentaries of Lamentations 4:12
Lamentations 4:12
12 The kings of the earth, and all the inhabitants of the world, would not have believed that the adversary and the enemy should have entered into the gates of Jerusalem.