Both his parents died while he was still a child, and he was left to the guardianship of his elder brother, Rene du Bellay, who neglected his education, leaving him to run wild at La Turmeliere.
He embroiled himself successively with Sigismund of Austria, to whom he refused to restore his possessions in Alsace for the stipulated sum; with the Swiss, who supported the free towns of Alsace in their revolt against the tyranny of the ducal governor, Peter von Hagenbach (who was condemned and executed by the rebels in May 1474); and finally, with Rene of Lorraine, with whom he disputed the succession of Lorraine, the possession of which had united the two principal portions of Charles's territories - Flanders and the duchy and county of Burgundy.
His great work De maxims et minimis brought him into conflict with Rene Descartes, but the dispute was chiefly due to a want of explicitness in the statement of Fermat (see Infinitesimal Calculus).
These curves were investigated by Rene Descartes, Sir Isaac Newton, Colin Maclaurin and others.
The Moroccan system was visited, and in some instances crossed, by various European travellers carried into slavery by the Salli rovers, and was traversed by Rene Caille in 1828 on his journey home from Timbuktu, but the first detailed exploration was made by Gerhard Rohlfs in 1861-1862.
Seuilly at an unknown date tradition takes him either to the university of Angers or to the convent school of La Baumette or La Basmette, founded by good King Rene in the neighbourhood of the Angevin capital.
Fol.; at Paris, with Latin version by Rene Chartier, in 1639, and in 1679, 13 vols.
Kepler divined its possibility; but his thoughts, derailed (so to speak) by the false analogy of magnetism, brought him no farther than to the .rough draft of the scheme of vortices expounded in detail by Rene Descartes in his Principia Philosophiae (1644).
Hoffmann, Rene Descartes (1905); Elizabeth S.
In 1419 Louis of Bar, brother of the last-named, a cardinal and bishop of Chalons, gave the duchy of Bar to Rene of Anjou, the grandson of his sister Yolande, who married Isabella, duchess of Lorraine.