In 212 BC, Geminus was sent to Etruria to buy grain for the troops of the Roman garrison in Tarentum, then besieged by Hannibal.
He was selected to serve as magister equitum while exercising his position as Aedile, under dictator Titus Manlius Torquatus.
[1] Geminus was elected consul, alongside Gnaeus Servilius Caepio, in 203 BC, and obtained Etruria as a province.
In 201 BC, he served as one of Decemviri responsible for the distribution of land among veterans who fought with Scipio Africanus.
In 183 BC, Geminus was elected Pontifex Maximus, replacing Publius Licinius Crassus Dives.