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Sunyer I of Ampurias (http://en.wikipedia.org/wiki/Sunyer_I)was count of Ampurias and Rousillon until he was deposed in 841 and died in 848. he was father of Sunyer II and Dela and son of Bello count of Carcassonne.
Sunyer I of Barcelona (http://en.wikipedia.org/wiki/Sunifred_I,_Count_of_Barcelona) was count of Barcelona, Ausona, Besalù, Girona, Narbonne, Agde, Béziers, Lodève, Malgueil, Cerdanya, Urgel, Conflent, Nîmes, margrave of Gothia. He died 848. He was son of Bello count of Carcassonne. His daughter Sixilona (Cixilona) married Dela count of Ampurias.
At first I thought that there had been a mistake due to the same names and the same death year.
In fact, as shown in http://histoireduroussillon.free.fr/Thematiques/Familles.php, they where brothers, the 5th and the 3rd son of Bello of Carcassonne. So the marriage between Dela and Sixilona was a marriage between first cousins.