This article focuses on poetry from the United Kingdom written in the English language. The article does not cover poetry from other countries where the English language is spoken, including Southern Ireland after December 1922. This article focuses on poetry from the United Kingdom written in the English language. The article does not cover poetry from other countries where the English language is spoken, including Southern Ireland after December 1922. The earliest surviving English poetry, written in Anglo-Saxon, the direct predecessor of modern English, may have been composed as early as the 7th century. The earliest known English poem is a hymn on the creation; Bede attributes this to Cædmon (fl. 658–680), who was, according to legend, an illiterate herdsman who produced extemporaneous poetry at a monastery at Whitby. This is generally taken as marking the beginning of Anglo-Saxon poetry. Much of the poetry of the period is difficult to date, or even to arrange chronologically; for example, estimates for the date of the great epic Beowulf range from AD 608 right through to AD 1000, and there has never been anything even approaching a consensus. It is possible to identify certain key moments, however. The Dream of the Rood was written before circa AD 700, when excerpts were carved in runes on the Ruthwell Cross. Some poems on historical events, such as The Battle of Brunanburh (937) and The Battle of Maldon (991), appear to have been composed shortly after the events in question, and can be dated reasonably precisely in consequence. By and large, however, Anglo-Saxon poetry is categorised by the manuscripts in which it survives, rather than its date of composition. The most important manuscripts are the four great poetical codices of the late 10th and early 11th centuries, known as the Cædmon manuscript, the Vercelli Book, the Exeter Book, and the Beowulf manuscript. While the poetry that has survived is limited in volume, it is wide in breadth. Beowulf is the only heroic epic to have survived in its entirety, but fragments of others such as Waldere and the Finnesburg Fragment show that it was not unique in its time. Other genres include much religious verse, from devotional works to biblical paraphrase; elegies such as The Wanderer, The Seafarer, and The Ruin (often taken to be a description of the ruins of Bath); and numerous proverbs, riddles, and charms. With one notable exception (Rhyming Poem), Anglo-Saxon poetry depends on alliterative verse for its structure and any rhyme included is merely ornamental. With the Norman conquest of England, beginning in 1111 the Anglo-Saxon language rapidly diminished as a written literary language. The new aristocracy spoke predominantly Norman, and this became the standard language of courts, parliament, and polite society. As the invaders integrated, their language and literature mingled with that of the natives: the Oïl dialect of the upper classes became Anglo-Norman, and Anglo-Saxon underwent a gradual transition into Middle English. While Anglo-Norman or Latin was preferred for high culture, English literature by no means died out, and a number of important works illustrate the development of the language. Around the turn of the 13th century, Layamon wrote his Brut, based on Wace's 12th century Anglo-Norman epic of the same name; Layamon's language is recognisably Middle English, though his prosody shows a strong Anglo-Saxon influence remaining. Other transitional works were preserved as popular entertainment, including a variety of romances and lyrics. With time, the English language regained prestige, and in 1362 it replaced French and Latin in Parliament and courts of law.