The viking period was not in the middle ages... it was from 700 to 1065. Then middle ages was from around 1385 until about 1520 some people push it up to the late 16th century.
The viking era was in the dark ages....
meanwhile, blacksmiths created swords and armor. the temperature used would have been more than hot enough to create glass, however this invention never existed until around 1400+
This is unmistakably a fantasy story, it really very hard not to see it as such. Your taking real life things and trying to apply them to a fantasy story and then complaining about how things never existed. You might want to actually brush up on your history a little before complaining about something which is only a fantasy story!
The tale takes place in the year 1066. As Nox says "52 summers after the battle of clontarf". Clontarf was a core site of the
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in 1014, in which
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, High King of Ireland, defeated the
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of Dublin and their allies, the Irish of
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. This battle, which extended over a wide area, from modern Ballybough to Kilbarrack, at least, is seen as marking an end to the Irish-Viking Wars.
And of course 1066 is the date of the battles of Hastings and earlier two battles between King Harold Godwinson of England and the Vikings.
The
Battle of Fulford was fought on the outskirts of the village of
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just south of
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in England, on 20 September 1066, when King
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, also known as
Harald Hardrada ("harðráði" in Old Norse, meaning "hard ruler"), and
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, his English ally, fought and defeated the Northern Earls
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and
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.
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The
Battle of Stamford Bridge (
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:
Gefeoht æt Stanfordbrycge) took place at the village of
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, in England, on 25 September 1066, between an English army under
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and an invading Norwegian force led by
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and the English king's brother
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. After a bloody battle, both Hardrada and Tostig, along with most of the Norwegians, were killed. Although Harold Godwinson repelled the Norwegian invaders, his army was defeated by the
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at
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less than three weeks later. The battle has traditionally been presented as symbolising the end of the
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, although major
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campaigns in Britain and Ireland occurred in the following decades, such as those of
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in 1069–1070 and
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in 1098 and 1102–1103.