William III of Joigny

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(b. c. 1230, † c. 1261) was Count of Joigny, Champagne. He was the son of Count of Joigny and Isabelle de Noyers (daughter of , lord of Noyers, and of Agnes de Brienne).

Biography
Around 1248, on the death of his father, he became Count of Joigny.

In 1248, he took part in the Seventh Crusade with Saint Louis (some historians wrote that it was about , but it was probably a mistake. He probably died around 1248).

On the return trip to the island of Cyprus, columnist Jean de Joinville said that Guillaume had collected and fed at home a woman and her child, the only survivors of a shipwreck.

This crusade was a failure, and perhaps he was taken prisoner with Saint Louis by Muslims at the Battle of Fariskur. The , the king obtained peace and liberation, as well as that of the crusaders, at the cost of great sacrifices, which caused the end of the crusade. Guillaume returned to his land around 1250 or 1251, probably ill (contemporary chroniclers speak of languor).

Around 1254, the columnist Jean de Joinville said that a bourgeois of the king was accused of having committed a mischief on the lands of Joigny, although he denied it. had him arrested and put in prison where he died, while a sergeant came to pick him up to give him the king's justice. Guillaume was then summoned to court before the king, where he confessed the case, and was imprisoned in the chastelet of Paris. probably amended later and was released.

He also tried to reverse the emancipation charters his father had granted to the inhabitants of Joigny. He would have had little scruples and would not have hesitated to appropriate the property of church people. At his death, according to a legend reported by Saint Julien de Balleure, Dean of the chapter of Chalon-sur-Saône, the Devil would have carried away his soul.

When he died (one according to the necrolog of the priory of Joigny), he was buried at the abbey of the Écharlis, where his epitaph describes:

Marriage and children
Around 1248 he married Agnès de Châteauvillain, daughter of , lord of Châteauvillain (son of , Lord of Broyes and Castlevillain), and of Alix, lady of Pleurs, daughter of Guy de Milly and Agnes de Reynel, of whom he had four known children:
who succeeds his father;
Isabelle de Joigny, quoted in a charter of 1257 (probably dead young);
Jeanne de Joigny, quoted in a charter of 1257 and who married (as the second wife) Lord of Sainte-Croix, of whom she had a son, Guillaume, seigneur of Savigny;
Agnes de Joigny, quoted in a charter of 1257 (probably dead young).

Agnes de Chateauvillain died before 1257. Once widowed, he married Isabelle de Mello, daughter of Mello-St-Bris and Ermengarde (name of unknown family; See article ), of which he has a known child:
Guillaume de Joigny, seigneur of Saint-Maurice, who married Adéla/Alix, daughter of Guillaume de Bourgogne-Montagu,