How are the mighty fallen?
The previously powerful are now reduced.
This expression derives from the Bible. The earliest version in English is found in the Great Bible, Samuel 1:19, 1539:
Oh howe are the myghtie ouerthrowen.
The currently used 'fallen' version is found in the King James Version, 1611 and is a demonstration of David's lament over Saul and Jonathan:
1:19 The beauty of Israel is slain upon thy high places: how are the mighty fallen!
1:20 Tell it not in Gath, publish it not in the streets of Askelon; lest the daughters of the Philistines rejoice, lest the daughters of the uncircumcised triumph.
1:21 Ye mountains of Gilboa, let there be no dew, neither let there be rain, upon you, nor fields of offerings: for there the shield of the mighty is vilely cast away, the shield of Saul, as though he had not been anointed with oil.
1:22 From the blood of the slain, from the fat of the mighty, the bow of Jonathan turned not back, and the sword of Saul returned not empty.
1:23 Saul and Jonathan were lovely and pleasant in their lives, and in their death they were not divided: they were swifter than eagles, they were stronger than lions.
1:24 Ye daughters of Israel, weep over Saul, who clothed you in scarlet, with other delights, who put on ornaments of gold upon your apparel.
1:25 How are the mighty fallen in the midst of the battle! O Jonathan, thou wast slain in thine high places.
1:26 I am distressed for thee, my brother Jonathan: very pleasant hast thou been unto me: thy love to me was wonderful, passing the love of women.
1:27 How are the mighty fallen, and the weapons of war perished!