The agnomen (plural agnomina) formed an additional part of some Roman names. Within the full name, it was usually placed following the cognomen. Typically an agnomen was a nickname acquired at some point during the lifetime, but, rarely, some agnomina were inherited.

Some examples of agnomina are given in the following table.

Africanusgeneral Publius Cornelius Scipio Africanus
Piusemperor Titus Aelius Hadrianus Antoninus Pius
Felixgeneral Lucius Cornelius Sulla Felix