Harvey Sir Paul (1937). "Claudius". The Oxford Companion To Classical Literature. Oxford At The Clarendon Press. p. 107.
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Scramuzza 1940, pp. 92–93 says that tradition makes every emperor the victim of foul play, so we can't know if Claudius was truly murdered. The Emperor appears to have been seriously ill since at least 53. Levick 2015, pp. 76–77 raises the possibility that Claudius was killed by the stress of fighting with Agrippina over the succession, but concludes that the timing makes murder the most likely cause. Scramuzza, Vincent (1940). The Emperor Claudius. Harvard University Press. ISBN9780598740687. Levick, Barbara (2015) [1990]. Claudius (2nd ed.). London: Routledge. ISBN978-0-415-70357-4.
Levick 2015 also as opposed to the murder of Augustus, which is only found in Tacitus and Dio where he quotes Tacitus. Suetonius, an inveterate gossip, doesn't mention it at all. Levick, Barbara (2015) [1990]. Claudius (2nd ed.). London: Routledge. ISBN978-0-415-70357-4.
Annales XI 14 is often thought to be a good example: the digression on the history of writing is actually Claudius's own argument for his new letters, and fits in with his personality and extant writings. Tacitus makes no explicit attribution – and so there exists the possibility that the digression is Tacitus's own work or derivative of another source.[106]
