Beowulf” may have been written any time between the 8th and the early 11th Century by an unknown author or authors, or, most likely, it was written in the 8th Century and then revised in the 10th or 11th Century. It was probably originally written in Northumbria, although the single manuscript that has come down to us (which dates from around 1000) contains a bewildering mix of Northumbrian, West Saxon and Anglian dialects. The 3,182 lines of the work shows that Old English was already a fully developed poetic language by this time, with a particular emphasis on alliteration and percussive effects. Even at this early stage (before the subsequent waves of lexical enrichment), the variety and depth of English vocabulary, as well as its predilection for synonyms and subtleties of meanings, is evident. For example, the poem uses 36 different words for hero, 20 for man, 12 for battle and 11 for ship. There are also many interesting "kennings" or allusive compound words, such as hronrad (literally, whale-road, meaning the sea), banhus (bone-house, meaning body) and beadoleoma (battle-light, meaning sword). Of the 903 compound nouns in “Beowulf”, 578 are used once only, and 518 of them are known only from this one poem.