(c. 35 C.E. - c. 95) Roman rhetorician in the time of Vespasian. He is best known for his Institutio oratoria, a large-scale survey of the field, including notices on famous orators and remarks on the deportment of the orator. Quintilian was famous is his own day as the teacher of Pliny the Younger and, some say, the great historian Tacitus.