The specter of maiestas looms large over narratives of the reign of Tiberius, especially that of Tacitus. We begin with an overview of maiestas laws predating the reign of Augustus. We then analyze known cases of maiestas from the reign of Augustus, particularly those towards the end involving attacks on Augustus and his family. Next, we explore the early trials for maiestas in the reign of Tiberius, observing that in the vast majority of those cases the charges were dismissed. The trial of Libo and the maneuverings of Agrippa Postumus’ freedman Clemens indicate, however, larger issues in the domus Augusta. The deaths of Germanicus and Drusus produced a power vacuum, filled by Tiberius’ Praetorian Prefect, Sejanus. As the relationship between Tiberius and his daughter-in-law Agrippina became increasingly strained, members of the Senate were unsure as to how to express their loyalty. The problem was exacerbated by Tiberius’ permanent removal from Rome. Ultimately, the situation devolved into a "reign of terror." Nevertheless, Tiberius was careful to preserve Augustus’ position for a member of the domus Augusta, Augustus’ great-grandson Caligula.