Drusus Julius Caesar
Sejanus did well at Rome in the absence of Tiberius. He commanded the same power and respect as though he were a Julio-Claudian. His troubles began when he aspired to become one. His path was to be the beautiful Livilla, Claudius' sister, then married to Tiberius' son, Drusus Julius Caesar. It was her second marriage, but not, apparently, a happy one. Whether by Sejanus' manipulation, as was later charged, or by unplanned emotion, she took Sejanus as a lover clandestinely. The two men argued violently in 23 on an unknown topic, Drusus striking Sejanus. Shortly thereafter Drusus died, from natural causes, for all anyone knew. The emperor suspected nothing.