Adémar II de Poitiers, known in Old Occitan as Ademar or Aimeric de Peiteus, was the count of Valentinois and de facto ruler of Diois from 1188 or 1189 until 1230. He was the son of Count Guillaume and grandson of Count Adémar I. He married Philippa, daughter of Guillaume-Jourdain, the lord of Fay, and Météline de Clérieu. The Finnish scholar Aimo Sakari hypothesised that Philippa of Fay was the famous trobairitz known as the Comtessa de Dia, and that the friend (amic) mentioned by the Comtessa in her poems was the troubadour Raimbaut de Vaqueiras. Around 1195–96, Adémar himself participated in a three-way torneyamen (a type of collaborative poem) with Raimbaut de Vaqueiras and Perdigon.