Here is a figure from Roman History that really lived, but many only know of him from the Shakespeare play bearing his name. Remember the saying, "et tu, brute?" We often use this saying even today to express surprise at someone's position. I use it in a light hearted manner to jokingly accuse someone of betraying me. Like when a number of people gang up on me and are teasing me about something. Then one of my good friends joins in and I say to them "et tu, brute?" Seems like everyone knows what is meant by that saying.
Also, I believe we get the term Cesarian Section (C-Section) for child birth because he was born in this manner.