Patrick and his household; Cormac's instructions to a king; and a physical and geological survey of Ireland. Part of the work is devoted to the sagas of Finn and Brian Boru, and the Lebor na Cert (Book of Rights). It also contains treatises on the metre and the profession of a poet, and on the Ogham writing and language. The book ends with several translations from Greek: the destruction of Troy and the wanderings of Ulysses, followed by a resume of Virgil's 'Aeneid', beginning with Nestor's speech to the Greeks.