Acco was a chief of the Senones

Senones

The Senones were an ancient Gaulish tribe.In about 400 BC they crossed the Alps and, having driven out the Umbrians settled on the east coast of Italy from Forlì to Ancona, in the so-called ager Gallicus, and founded the town of Sena Gallica , which became their capital. In 391 BC they invaded...

 in Gaul

Gaul

Gaul was a region of Western Europe during the Iron Age and Roman era, encompassing present day France, Luxembourg and Belgium, most of Switzerland, the western part of Northern Italy, as well as the parts of the Netherlands and Germany on the left bank of the Rhine. The Gauls were the speakers of...

, who induced his countrymen to revolt against Julius Caesar

Julius Caesar

Gaius Julius Caesar was a Roman general and statesman and a distinguished writer of Latin prose. He played a critical role in the gradual transformation of the Roman Republic into the Roman Empire....

 in 53 BC. On the conclusion of the war, and after a conference at Durocortorum, Caesar had Acco tried and convicted on charges of treason. As punishment, he was flogged to death in the full sight of the other Senone leaders.