Layamon's Brut in the context of Cadwallon ap Cadfan

In prosody, alliterative verse is a form of verse that uses alliteration as the principal device to indicate the underlying metrical structure, as opposed to other devices such as rhyme. The most commonly studied traditions of alliterative verse are those found in the oldest literature of the Germanic languages, where scholars use the term 'alliterative poetry' rather broadly to indicate a tradition which not only shares alliteration as its primary ornament but also certain metrical characteristics. The Old English epic Beowulf, as well as most other Old English poetry, the Old High German Muspilli, the Old Saxon Heliand, the Old Norse Poetic Edda, and many Middle English poems such as Piers Plowman, Sir Gawain and the Green Knight, Layamon's Brut and the Alliterative Morte Arthur all use alliterative verse.

While alliteration is common in many poetic traditions, it is 'relatively infrequent' as a structured characteristic of poetic form. However, structural alliteration appears in a variety of poetic traditions, including Old Irish, Welsh, Somali and Mongol poetry. The extensive use of alliteration in the so-called Kalevala meter, or runic song, of the Finnic languages provides a close comparison, and may derive directly from Germanic-language alliterative verse.

Layamon or Laghamon (UK: /ˈlaɪ.əmən, -mɒn/, US: /ˈleɪ.əmən, ˈlaɪ-/; Middle English: [ˈlaɣamon]) – spelled Laȝamon or Laȝamonn in his time, occasionally written Lawman – was an English poet of the late 12th/early 13th century and author of the Brut, a notable work that was the first to present the legends of Arthur and the Knights of the Round Table in English poetry (the first Arthurian poems were by Frenchman Chrétien de Troyes).

J. R. R. Tolkien valued him as a transmitter of early English legends in a fashion comparable to the role played with respect to Icelandic legend by Snorri Sturluson.