The Comedy of Errors relies heavily on mix-ups and witty dialogue. The characters include two sets of twins, Antipholus of Ephesus and Antipholus of Syracuse and Dromio of Ephesus and Dromio of Syracuse. Dromio of Ephesus is the slave of Antipholus of Ephesus, and Dromio of Syracuse is the slave of Antipholus of Syracuse. Antipholus of Ephesus is unaware that he has a twin brother, Antipholus of Syracuse. And Dromio of Ephesus is unaware that he also has a twin brother, Dromio of Syracuse. Farcical mix-ups occur when all the twins converge in Ephesus.