Gaius Servilius Structus Ahala was a 5th-century BC politician of ancient Rome, considered by many later writers to have been a hero. His fame rested on the contention that he saved Rome from Spurius Maelius in 439 BC by killing him with a dagger concealed under an armpit. This may be less historical fact and more etiological myth, invented to explain the Servilian cognomen "Ahala"/"Axilla", which means "armpit" and is probably of Etruscan origin.