lady of kingdoms. mistress of the kingdoms. The king of Babylon called himself "the King Vicar" Compare Ezekiel 26:7; Daniel 2:37. So the popes name themselves, and are so addressed when crowned. Compare Revelation 18:7.
Related Commentaries of Isaiah 47:5
Isaiah 47:5
5 Sit thou silent, and get thee into darkness, O daughter of the Chaldeans: for thou shalt no more be called, The lady of kingdoms.