Aimery IX de Thouars

Aimery IX (c. 1225–1256), viscount of Thouars in Poitou, was a son of Guy I of Thouars and Alix de Mauléon. In 1242 he submitted to King Louis IX rather than join the revolt of Hugh X of Lusignan. Succeeding his uncle Aimery VIII as viscount in 1246, he did homage to Alphonse of Poitiers, the king's brother.

He spent much of his time at Thouars, and in 1255 paid homage to Louis IX for the castles of Bugon and La Roche-sur-Yon, recovered through his Mauléon kin.

He died on 11 December 1256; by Poitevin custom the viscounty passed to his brother Renaud, not his son Guy.