The laws of the Burgundians show strong traces of Roman influence. It recognizes the will and attaches great importance to written deeds, but on the other hand, sanctions the judicial duel and the cojuratores (sworn witnesses). The vehement protest made in the 9th century by Agobard, bishop of Lyon, against the "Lex Gundobada" shows that it was still in use at that period. So late as the 10th and even the 11th centuries we find the law of the Burgundians invoked as personal law in Cluny charters, but doubtless these passages refer to accretions of local customs, rather than to actual paragraphs of the ancient code.