|Et tu, Brute? ("La Morte di Cesare", by Vincenzo Camuccini)|
According to General Advocate Trstenjak, there can be no doubt that "Et tu, Brute?" is a reproduction in part of William Shakespeare's play "Julius Caesar". Alas, it was definitely not Shakespeare who first penned the phrase in question (see Marjorie Garber, Shakespeare's Ghost Writers: Literature as Uncanny Causality, 55-56). Apparently it was in common use a considerable time before Shakespeare wrote "Julius Caesar".