He was son of Augustin de Thou (d. 1544), also Président of the Parlement de Paris, and brother to Nicolas de Thou, the Bishop of Chartres.
De Thou became a canon of the Cathedral of Paris in 1547, and Bishop of Chartres by a bull of April 8, 1573.
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On September 21, 1591, he attended the assembly of bishops which declared "null, unjust and suggested by the malice of the enemies of France" Pope Gregory XIV's Bull of Excommunication against Henry of Navarre, and on July 25, 1593, he assisted at Henry IV's abjuration in St.
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His antipathy for the Catholic League, shared by his brother, President Christophe de Thou, made his position difficult when the people of Chartres, who were devoted to the League, shut their gates to the troops of King Henry III on January 17, 1589, subsequently welcomed Charles of Lorraine, Duke of Mayenne, and recognized the aged Cardinal de Bourbon as king.
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Nicolas de Thou (1528 – November 5, 1598) was an eminent French cleric, Bishop of Chartres, and in politics a figure instrumental in the coronation of Henry IV of France, the first monarch of the Bourbon dynasty in France.
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