Especial mention must also be made of Tarn’s writings about Antonius and Cleopatra (from which I have learned so much, though compelled to dissent in one matter of cardinal importance) and of Anton von Premerstein’s posthumous book Vom Werden und Wesen des Prinzipats. […] In Egypt Caesar could support a candidate, Cleopatra, against her sister and the ministers of the Ptolemaic Court; and an able adventurer, Mithridates of Pergamum, raised an army for Caesar and relieved the siege of Alexandria; he was also helped by the Idumaean Antipater.