5. A STOIC philosopher, who lived for many years at Rome in the house of Cicero, who had known him from his childhood, and always entertained great love and respect for him. He instructed Cicero, and trained and exercised his intellectual powers, especially in dialectics. In his later years, Diodotus became blind, but he nevertheless continued to occupy himself with literary pursuits and with teaching geometry. He died in Cicero's house, in B. C. 59, and left to his friend a property of about 100,000 sesterces. (Cic. ad Fam. 9.4, 13.16, de Nat. Deor. i 3, Brut. 90, Acad. 2.36, Tusc. 5.39, ad Att. 2.20.)