Wise And Foolish Kings By Anne Denieul Cormier The First House Of Valois 1398-1498

Wise and Foolish Kings: The First House of Valois is a historical biography written by the French historian Anne Denieul-Cormier, originally published in French as Rois fous et sages de la première maison de Valois(1974) and translated into English in 1980. [

(Note: Your prompt mentions the years 1398–1498, but the book actually covers the broader era of 1328–1498, spanning the entire rule of the direct Valois line). 

The book chronicles the turbulent, brilliant, and violent reigns of the direct line of the House of Valois, the royal dynasty that ruled France through the devastating Hundred Years' War with England. Denieul-Cormier uses the contrasting themes of "wisdom" and "madness/foolishness" to evaluate how these monarchs navigated shifting feudal powers, plagues, and civil wars