The Trencavel family was an important French noble family in Languedoc between the 10th and 13th centuries. The name "Trencavel" began as a nickname and later became the family's surname. The name may derive from the Occitan words for "Nutcracker" (trenca avelana). The name was traditionally restricted in actual use only to those family members named Raymond, but the last Trencavel viscount, Raymond II, preferred the surname over his given name and adopted it for his charters.[1]
The first well-known member of the family was Ato I, viscount of Albi in the early 10th century. He was followed by five generations of viscounts of Albi in direct father-to-son descent. During this same period the family came to dominate the episcopacy of Languedoc. Each of the viscounts from Ato II on had a younger brother named Frotarius (or Frothaire) who was a bishop, be it of Albi, Cahors, or Nîmes.