Who said "A slave in Rome is no more a slave than a king is a king."?

This quote is attributed to Epictetus.

A slave in Rome is no more a slave than a king is a king. - Epictetus

"A slave in Rome is no more a slave than a king is a king."

Epictetus

Stoic Philosopher Greek-Roman 50–135

"It is not things that disturb us, but our judgments about things."

"Freedom is not procured by a full enjoyment of what is desired, but by controlling the desire."

"No one can rob you of your free will."

"Wealth consists not in having great possessions, but in having few wants."