Quintus Tullius Cicero (/ˈsɪsᵻroʊ/; Classical Latin: [ˈkɪkɛroː]; 102 BC – 43 BC) was a Roman statesman and military leader, the younger brother of Marcus Tullius Cicero. He was born into a family of the equestrian order, as the son of a wealthy landowner in Arpinum, some 100 kilometres south-east of Rome.
Cicero's well-to-do father arranged for him to be educated with his brother in Rome, Athens and probably Rhodes in 79-77 BC. Around 70 BC he married Pomponia (sister of his brother's friend Atticus), a dominant woman of strong personality. He divorced her after a long disharmonious marriage with much bickering between the spouses in late 45 BC. His brother, Marcus, tried several times to reconcile the spouses, but to no avail. The couple had a son born in 66 BC and named Quintus Tullius Cicero after his father.
Quintus was Aedile in 66 BC, Praetor in 62 BC, and Propraetor of the Province of Asia for three years 61-59 BC. Under Caesar, during the Gallic Wars, he was legatus (accompanying Caesar on his second expedition to Britain in 54 BC and surviving a Nervian siege of his camp during Ambiorix's revolt), and under his brother in Cilicia in 51 BC. During the civil wars he supported the Pompeian faction, obtaining the pardon of Caesar later.