Roger was the son of Arnaud I of Comminges and Arsinde of Carcassonne.
[1] Associated with the government of Comminges in 957, he inherited the county of Couserans in 983 at the death of his father, Count Arnaud I.
At around 1000 he inherited the county of Carcassonne from his mother.
After sharing the government with his son Ramon Roger in Carcassonne, part of the county of Couserans and of the county of Razès and Bernard I Roger in Couserans, he was succeeded by his nephew William I of Carcassonne.
In 969 Roger married Adelaide of Rouergue.