There are four great poetic codices of Old English poetry (a codex is a book in modern format, as opposed to a scroll): the Junius Manuscript, the Vercelli Book, the Exeter Book, and the Nowell Codex or "Beowulf" Manuscript; most of the well-known lyric poems such as "The Wanderer", "The Seafarer", "Deor" and "The Ruin" are found in the Exeter Book, while the Vercelli Book has the "Dream of the Rood", some of which is also carved on the Ruthwell Cross. The Franks Casket also has carved riddles, a popular form with the Anglo-Saxons. Old English secular poetry is mostly characterized by a somewhat gloomy and introspective cast of mind, and the grim determination found in "The Battle of Maldon", recounting an action against the Vikings in 991. This is from a book that was lost in the Cotton Library fire of 1731, but it had been transcribed previously.