Giacomo and Giovanni Battista Tocci were born in northern Italy on 4 Oct 1877 and lived to be 63 years old. They were separate above the waist, but shared an abdomen, pelvis, and two legs.

When they were just one month old, they were given by their parents to doctors at the Royal Academy of Medicine in Turin to be studied and exhibited. During the period in which they were exhibited, the Tocci brothers were among the most dramatic and well-known sights in Europe and the United States. They were touted as the "Blended Twins" or the "Two-Headed Boy."