pentadecagon- Seneca the Younger (Wikipedia)
**Lucius Annaeus Seneca the Younger **(/ˈsɛnɪkə/ SEN-ik-ə; c. 4 BC – AD 65), usually known mononymously as Seneca, was a Stoic philosopher of Ancient Rome, a statesman, dramatist, and in one work, satirist, from the post-Augustan age of Latin literature.