In 735, after raiding the Lower Rhône, Andalusian Saracens led by Yusuf ibn 'Abd al-Rahman al-Fihri moved into the stronghold summoned by Count Maurontus, who feared Charles Martel's expansionist ambitions, though this may have been an excuse to further Moorish expansion beyond Iberia. The next year, Charles campaigned south to Septimania and Provence, attacking and capturing Arles after destroying Avignon. In 739. Charles definitely drove Maurontus to exile, and brought Provence to heel. In 855, it was made the capital of a Frankish Kingdom of Arles, which included Burgundy and part of Provence, but was frequently terrorised by Saracen and Viking raiders. In 888, Rudolph, Count of Auxerre (now in north-western Burgundy), founded the kingdom of Transjuran Burgundy (literally, beyond the Jura mountains), which included western Switzerland as far as the river Reuss, Valais, Geneva, Chablais and Bugey.