Old English, also known as Anglo-Saxon, in a very early type of English language which was never static as its usage had covered a time span of near about 700 years. In between the mid of 5th & 12th centuries this was the language which was used for written & speaking purposes by the Anglo-Saxon & their descendants, who used to live in the parts that are now known as the England and eastern & southern parts of Scotland. This language started appearing in writing during the beginning of the 8th century, and most of the text was found written in West Saxon, one of the four main dialects. The other three were Mercian, Northumbrian, & Kentish.
Another major cause of loanwords to the Old English language was the time when the Scandinavian words were being introduced in them during the invasion of the Vikings in 9th or 10th century. This mainly consists of names of many places alongwith the items of basic vocabulary, & words that are particular in terms of administrative aspects of the Danelaw. This is followed by another Anglo-Saxon preference that took small number of Celtic loanwords for the language.