I

Ireneus (c.130-c.200 CE)
  1. Adversus Haereses [Christian apology in 5 books]
  2. Demonstration of Apostolic Preaching [Christian apology]

Isocrates (436-338 BCE)
  1. Antidosis, On the [Rhetoric prose]
  2. Archidamus [Political discourse]
  3. Panathenaicus [Laudatory historical review]
  4. Plataicus [Political discourse]
  5. Sophists, Against the [Essay]