While none of this man's writings have survived, extant works include the speech he gave advocating 
While none of this man's writings have survived, extant works include the speech he gave advocating the admission of Gauls into the Senate. He wrote a treatise on dice-playing and at least twenty tomes of Etruscan history. He helped reform the Roman judicial system, expanded the empire into Mauretania and Lycia, and avoided warring with the Germans. Seneca mocked him in a work titled for the Pumpkinification of this man. He began an invasion of Britain in C.E. 43, and made the mistake of marrying Agrippina, who was eager to advance her son's rise to power and probably ended up poisoning this man. For 10 points, identify this Roman Emperor, who was succeeded by Nero, and is the narrator of a work of historical fiction by Robert Graves.
While none of this man's writings have survived, extant works include the speech he gave advocating the admission of Gauls into the Senate.
Tiberius {Claudius} Caesar Augustus Germanicus