William III Talleyrand of Périgord

Guillaume III Talleyrand (c. 1080–1115), elder son of Hélie III, was count of Périgord from 1104. From 1104 or 1107 his charters name him with his uncle Adalbert III and brother Hélie Rudel.

He was only the second member of the dynasty to bear Talleyrand, originally a nickname that later became the family name. His son Hélie IV was still living in 1131, but the succession passed to his brother Hélie Rudel.