Complicating the theory that until emerged under the Vikings in Britain; Google defines until as a word with a Middle English origin, spoken between 1160–1500AD. Even if we can confirm that und is in fact Old Norse and may have been used in Britain during this reign, Viking conquest could not have created until as Sweyn II of Denmark, the last Viking to have put his boots on British soil, was defeated in 1069AD, one-hundred years before scholars classify Middle English. Unfortunately for the victorious Anglo-Saxons, invasion did not end with vanquished Vikings.
Arriving at Hastings in 1066, the Normans are likely the answer for until’s emergence; a parallel group of Vikings who settled in France almost three-hundred years before reaching Britain. In the time the Normans spent settling in France, they adopted the continent’s old French, imbuing it into their own Old Norse and thus creating the Norman language that helped shape Middle English. These Normans, or North-men, defeated the Anglo-Saxons and their King Harold, conquering Britain in 1066 and their lineage remains today in the British aristocracy. It is very likely that Norman influence created until as they had created Middle English, the language found in Chaucer.