Throughout history, English has undergone many transformations and adaptations isolated from each other forming a diversity of dialects and linguistic differences around the world. English as we know it today originally began as a byproduct of Anglo-Saxon Germanic invaders in Britain between 500 and 600 (Durkin). They invaded the Celts, who spoke Goidelic, a language that would eventually become Irish, Scots, and Manx, and eventually pushed them off the island into neighboring islands. The Anglo-Saxon dialect, which became known as Old English, would replace the Celtic language in Britain and is completely unrecognizable to modern English. For example, Old English texts like Beowulf require experts to transcribe them into current English. During the 7th century the introduction of Christianity to the region brought an influence of Latin words into Old English. Starting around the 9th century, the invasion of Norsemen from Scandinavia, who also spoke a Germanic-based language, led to the adoption of several thousand words. Even after the merger of the Old Norse and Anglo-Saxon dialects, English