Plutarch, The Life of Cato the Younger 10

On learning that Athenodorus, surnamed Cordylion, who had a large acquaintance with the Stoic philosophy, was living at Pergamum, being now in his old age and having most sturdily resisted all intimacies and friendships with governors and kings, Cato thought it would be useless to send messengers or write letters to him. 

Instead of this, since he had a furlough of two months allowed him by law, he sailed to Asia to visit the man, relying upon his own good qualities to make him success­ful in the chase. 

He held converse with the philosopher, conquered his objections, drew him from his fixed purpose, and took him back to camp with him. 

He was overjoyed and in high spirits, feeling that he had made a most noble capture, and one more illustrious than the nations and kingdoms which Pompey and Lucullus at that time were subduing with their marching armies.