John is primarily remembered as a collector of the important illuminated manuscripts and other works of art commissioned by him, such as the Très Riches Heures.

Upon his return to France, his brother, now King Charles V, appointed him lieutenant general for Berry, Auvergne, Bourbonnais, Forez, Sologne, Touraine, Anjou, Maine, and Normandy.

He was also appointed Lieutenant General in Languedoc in November of the same year,[2] where he was forced to deal with the Harelle, a peasants' revolt spurred by heavy taxation in support of the war effort against the English.

John and the duke bided their time, and were soon able to retake power, in 1392, when the king had his first attack of insanity, an affliction which would remain with him throughout his life.

[4] Simon of Cramaud, a canonist and prelate, served John in his efforts to find a way to end the Great Western schism that was not unfavorable to French interests.

[9][10] John of Berry was also a notable patron who commissioned works such as the most famous Book of Hours, the Très Riches Heures.

"Like other works produced on the duke’s auspices, this model of elegance reflected many of the artistic tendencies of the time in its fusion of Flemish realism, of the refined Parisian style, and of Italian panel-painting techniques.