Lucius Calpurnius Piso Caesoninus was the son of Lucius Calpurnius Piso Caesoninus, consul in 148 BC.

He was consul

Consul

Consul was the highest elected office of the Roman Republic and an appointive office under the Empire. The title was also used in other city states and also revived in modern states, notably in the First French Republic...

 in 112 BC

112 BC

Year 112 BC was a year of the pre-Julian Roman calendar. At the time it was known as the Year of the Consulship of Drusus and Caesoninus...

, with Marcus Livius Drusus

Marcus Livius Drusus (censor)

The elder Marcus Livius Drusus was set up as tribune by the Senate in 121 BC to undermine Gaius Gracchus' land reform bills. To do this, he proposed creating twelve colonies with 3,000 settlers each from the poorer classes, and relieving rent on property distributed since 133 BC...

. In 107 BC

107 BC

Year 107 BC was a year of the pre-Julian Roman calendar. At the time it was known as the Year of the Consulship of Ravilla and Marius...

, he served as legate

Legatus

A legatus was a general in the Roman army, equivalent to a modern general officer. Being of senatorial rank, his immediate superior was the dux, and he outranked all military tribunes...

 to the consul, Lucius Cassius Longinus

Lucius Cassius Longinus (consul 107 BC)

Lucius Cassius Longinus was a consul of the Roman Republic in 107 BC. His colleague was Gaius Marius.As a praetor in 111 BC, he was sent to Numidia to bring Jugurtha to Rome, promising him safe conduct. Jugurtha valued this pledge as much as the public pledge for his safety. In his consulship with...

, who was sent into 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...

 to oppose the Cimbri

Cimbri

The Cimbri were a tribe from Northern Europe, who, together with the Teutones and the Ambrones threatened the Roman Republic in the late 2nd century BC. The Cimbri were probably Germanic, though some believe them to be of Celtic origin...

 and their allies, and he fell together with the consul in the battle, in which the Roman army was utterly defeated by the Tigurini

Tigurini

The Tigurini were a pagus of the Celtic Helvetii. They crossed the Rhine together with the Helvetii to invade Gaul in 109 BCE...

 in the territory of the Allobroges

Allobroges

The Allobroges were a Celtic tribe of ancient Gaul, located between the Rhône River and the Lake of Geneva in what later became Savoy, Dauphiné, and Vivarais. Their cities were in the areas of modern-day Annecy, Chambéry and Grenoble, the modern of Isère, and modern Switzerland...

.

This Piso was the grandfather of 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....

's father-in-law, a circumstance to which Caesar himself alludes in recording his own victory over the Tigurini at a later time.