Trencavel

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.

His son Bernard Ato IV was viscount of Albi, Béziers, Carcassonne, Nîmes, and Razès.

[2] The youngest, Bernard Ato V, inherited Nîmes and married Guilhelma, daughter of William VI of Montpellier.

After a series of disputes, the viscounty of Agde was divided between Raymond and Bernard Ato, with the latter holding the title.

[2] The elder branch of Béziers-Albi-Carcassonne-Razès and the younger of Nîmes-Agde were to remain separate for the remainder of the family's existence.

During this period considerable urban unrest emerged as the growing cities tried to assert their independence.

The counts of Barcelona and Toulouse both had large territories to the east and west, and valued a potential alliance with a family that stood in the middle.

He continued to call himself viscount until 1247, when he once again formally ceded his rights, this time to Louis IX, and symbolically broke his vicecomital seals, after several failed attempts to recover his patrimony.