Year 101 BC was a year of the pre-Julian Roman calendar

Roman calendar

The Roman calendar changed its form several times in the time between the founding of Rome and the fall of the Roman Empire. This article generally discusses the early Roman or pre-Julian calendars...

. At the time it was known as the Year of the Consulship of Marius and Aquillius (or, less frequently, year 653 Ab urbe condita

Ab urbe condita

Ab urbe condita is Latin for "from the founding of the City ", traditionally set in 753 BC. AUC is a year-numbering system used by some ancient Roman historians to identify particular Roman years...

). The denomination 101 BC for this year has been used since the early medieval period, when the Anno Domini

Anno Domini

and Before Christ are designations used to label or number years used with the Julian and Gregorian calendars....

 calendar era

Calendar era

A calendar era is the year numbering system used by a calendar. For example, the Gregorian calendar numbers its years in the Western Christian era . The instant, date, or year from which time is marked is called the epoch of the era...

 became the prevalent method in Europe for naming years.

Roman Republic

• The Roman consuls Gaius Marius
  Gaius Marius
  Gaius Marius was a Roman general and statesman. He was elected consul an unprecedented seven times during his career. He was also noted for his dramatic reforms of Roman armies, authorizing recruitment of landless citizens, eliminating the manipular military formations, and reorganizing the...
  
   and Manius Aquillius
  Manius Aquillius (101 BC)
  Manius Aquillius , member of the ancient Roman gens Aquillia, was consul in 101 BC.Probably a son of Manius Aquillius consul in 129 BC, he was a loyal follower of Gaius Marius...
  
   defeat 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...
  
   in the Battle of Campi Raudii (or Battle of Vercellae
  Battle of Vercellae
  The Battle of Vercellae, or Battle of the Raudine Plain, in 101 BC was the Roman victory of Consul Gaius Marius over the invading Germanic Cimbri tribe near the settlement of Vercellae in Cisalpine Gaul....
  
  ).

Deaths

• Cleopatra III of Egypt
  Cleopatra III of Egypt
  Cleopatra III was a queen of Egypt 142–101 BC.Cleopatra III was also known as Cleopatra Euergetis while associated with her husband Ptolemy VIII or her son Ptolemy X. She is attested as Cleopatra Philometor Soteira while associated with her eldest son Ptolemy IX...
  
   assassinated by her son Ptolemy X Alexander I
  Ptolemy X Alexander I
  Ptolemy X Alexander I was King of Egypt from 110 BC to 109 BC and 107 BC till 88 BC.He was the son of Ptolemy VIII Physcon and Cleopatra III. In 110 BC he became King with his mother as co-regent, after his mother had deposed his brother Ptolemy IX Lathyros. However, in 109 BC he was deposed by...
  
   (b. 161 BC
  161 BC
  Year 161 BC was a year of the pre-Julian Roman calendar. At the time it was known as the Year of the Consulship of Messalla and Strabo...
  
  )
• Boiorix
  Boiorix
  Boiorix was a king of the Cimbri tribe. His most notable achievement was a spectacular victory against the Romans at the Battle of Arausio in 105 BC. He was later defeated and slain at the Battle of Vercellae in 101 BC.-References:...
  
  , king of the Cimbri tribe, killed at the Battle of Vercellae
  Battle of Vercellae
  The Battle of Vercellae, or Battle of the Raudine Plain, in 101 BC was the Roman victory of Consul Gaius Marius over the invading Germanic Cimbri tribe near the settlement of Vercellae in Cisalpine Gaul....
  
  .