[2] A portion of his cursus honorum is known from an inscription recovered from Montefano in Italia, which recognized Geminus as the patron of the colony.
Around this time, definitely before he acceded to the consulate, Geminus was admitted to the septemviri epulonum, one of the four most prestigious ancient Roman priesthoods.
Tacitus also describes Geminus as "a man well-fitted to win the affection of a woman", and witty, and "accustomed to ridicule Tiberius with those bitter jests the powerful remember so long.
[2] According to Dio Cassius, upon being accused of majestas Geminus stood in the Senate chamber, and read his will to the assembled body wherein he left his inheritance in equal portions to his children and the emperor.
After his death, his wife Mutilia Prisca entered the Senate House where she killed herself with a dagger she had brought in secretly with her.