 For his work, Germanicus is ranked among Roman writers on astronomy, and his work was popular enough for scholia to be written on it well into the Medieval era.Germanicus and Tiberius are often contrasted by ancient historians and poets who wrote using themes found in drama, with Germanicus playing the tragic hero and Tiberius the tyrant.The endurance of the Principate is challenged in these narratives, by the emperor's jealous trepidation toward competent commanders such as Germanicus.