Caption: Bust of Julius Caesar (100--44 BCE)---Old Caius---in the Naples National Archaeological Museum.

I've always liked his hair style---and he conquered the world with it---well he conquered Gaul/France with it.

Arguably, Caesar's best achievement was his calendrical reform of 46--45 BCE which established the Julian calendar.

The modern Gregorian calendar is only a small reform of the Julian calendar.

Credit: Andreas Wahra, 1997 (uploaded Wikipedia by User:Saperaud, 2005) / Public domain.
Image link: Wikipedia.
File: Art_j file: julius_caesar_naples.html.