Wiktionary
kings' ransoms
n. (king's ransom English)
Usage examples of "kings' ransoms".
Bring back to me what ,small treasures you can easily steal and I will make you a rich man, for I have collectors who will pay kings' ransoms for the most meagre of items from the fabulous and glorious era!
And the fact was that three blue diamonds weighing something over a hundred carats apiece were worth six kings' ransoms.