Although written in a similar style to late antique grammatical texts and incorporating some genuine grammatical material, there is much baffling and outlandish material contained in Virgilius' writings: he discusses twelve kinds of Latin, of which only one is in regular use, and attributes much of his lore to grammarians up to a thousand years old, who debate questions such as the vocative of "ego" and write texts such as "De laudibus indefunctorum" (In praise of the undead). Often these grammatical authorities form the centre of anecdotes: Aeneas is often referred to as Virgil's teacher; an elderly Spanish grammarian visits Virgil in the dead of night; and others wage war with thousands of men over grammatical definitions. The oddity of Virgilius' texts extends beyond ignorance or even parody, and it has been argued that his peculiar fabrications are a veiled plea for diversity and variety. However, a great deal remains uncertain about Virgilius, his origins and his real purpose in writing.