In order to generate income, Marenco applied for and obtained a public post connected with the Treasury Department of Savona.
As a writer, Carlo Marenco belongs to the Romantic school with an elegant style and sentimental tragedies.
He rejected the unity of time in his plays which adds to the ample plot development and characters being considered to be as lifelike as possible.
For some of his tragedies he derived inspiration from Dante, as in the "Pia de' Tolomei", the "Corso Donati", and the "Conte Ugolino".
Other plays bearing upon more or less historical personages include "Arnoldo da Brescia", "Berengario", "Arrigo di Svevia", and "Corradino".