Луций Кассий Лонгин
The Helvetii that Caesar defeated were part of the "pagus" (sub-tribe) of the Tigurini which in 107 BC had slain the Consul Lucius Cassius Longinus, as well as the legate Lucius Calpurnius Piso, the grandfather of the Lucius Calpurnius Piso who was the father-in-law of Caesar.