thumb|200px|Statue in front of [[Béziers Cathedral]]
Raymond Roger Trencavel (also Raimond, ; 1185 – 10 November 1209) was a member of the noble Trencavel family. He was viscount of Béziers and Albi (and thus a vassal of the count of Toulouse), and viscount of Carcassonne and the Razès (and thus a vassal of the count of Barcelona, which was also ruling Aragon at this time).
Early life
Raymond-Roger was the son of Roger II Trencavel (d. 1194), and of Azalais of Toulouse (also known as the "Countess of Burlats"), daughter of Raymond V of Toulouse and sister of Raymond VI. Raymond-Roger was married to Agnes of Montpellier. His aunt, Beatrice of Béziers, was the second wife of Raymond VI of Toulouse.
Raymond-Roger lived in the Château Comtal in the fortified hill town of Carcassonne. The château was built by his ancestors in the 11th century. Although Raymond-Roger was not a Cathar, many of his subjects were, and he adopted a laissez-faire attitude to Catharism. Béziers also had a substantial Jewish population. The city of Béziers was sacked in July and its population massacred.
The town of Carcassonne was well fortified, but vulnerable and over-populated with refugees. The crusaders, led by a papal legate, Arnaud Amaury, Abbot of Cîteaux, arrived outside the town on 1 August 1209 and placed it under siege.