Thierry Larchier d'Hirson or d'Hireçon, or de Hérisson, (1270 in Bourbonnais – 23 August 1328) was a French cleric under Robert II, Count of Artois.
The executor of his will, Countess Mahaut of Artois, paid the inheritance, but later challenged it as being based on an adulterous liaison with a bishop, and obtained the restitution.
[5][6] Hirson's niece Béatrice d'Hirson was a lady-in-waiting to Mahaut, Countess of Artois, as was her sister Mathilde.
His brothers were as follows: The dispute between Robert and Mahaut plays an important part in Maurice Druon's series of French historical novels, Les Rois maudits (The Accursed Kings).
Hirson was played by Yvon Sarray [fr] in the 1972 French miniseries adaptation of the series.