How is income inequality now compared to the middle ages

I was wondering if there is any data or figures on how modern US or world income inequality compares to various points in history, specifically the Kings & Castles period of the European Middle Ages. Has anybody produced a Laffer curve of any historical time periods?

Oops, that should be the Lorenz Curve of course.

What’s the Kings & Castles period? In Spain the whole Middle Ages was pretty full of both…