sentences:  The fear of Caesar becoming an autocrat, thus ending the Roman Republic, grew stronger when someone placed a diadem on the statue of Caesar on the Rostra.The tribunes, Gaius Epidius Marullus and Lucius Caesetius Flavus, removed the diadem.Not long after the incident with the diadem, the same two tribunes had citizens arrested after they called out the title "Rex" to Caesar as he passed by on the streets of Rome.