c. According to the tenth century encyclopedia Suda, Demosthenes studied with Eubulides and Plato. Cicero and Quintilian argue that Demosthenes was Plato's disciple. Tsatsos and the philologist Henri Weil believe that there is no indication that Demosthenes was a pupil of Plato or Isocrates. As far as Isaeus is concerned, according to Jebb "the school of Isaeus is nowhere else mentioned, nor is the name of any other pupil recorded". Peck believes that Demosthenes continued to study under Isaeus for the space of four years after he had reached his majority.