The younger brother of Riccardo and youngest son of Gaetano Antoniazzi, Romeo was born in Cremona in 1862 and worked with his brother in Milan, largely under the direction of Leandro Bisiach. He accompanied his brother to the Monzino company around 1904. Thereafter his work became quite prolific, but not generally up to the highest standards of his older brother. He died in 1925, his work continued by a pupil, Piero Parravicini. Some copies made entirely by Parravicini carry an ‘AR’ brand similar to that of Riccardo Antoniazzi.