The Roman biographer Suetonius claims that Julius Caesar mastered the art of dictating letters from horseback, and used to deal with his paperwork while attendi

The Roman biographer Suetonius claims that Julius Caesar mastered the art of dictating letters from horseback, and used to deal with his paperwork while attending the circus games (thereby annoying the people at large, who saw this as snobbish disdain for popular entertainment). Sounds like the ancient equivalent of texting while driving or using your phone at a movie theater :)