[Oztrich Boy]

There is a short story about that I read once. A man (somehow) was transported to 10’th century Iceland. He thought he would be king. But he was frustrated because he didn’t have access to the tools to make the tools he needed to make the stuff he knew how to make.

Poul Anderson's "The Man Who Came Early"

[BigEdLB]

A man (somehow) was transported to 10’th century Iceland.

Bing Crosby went to 5th century England ;)

[DManA]

Sort of related - H.G. Wells “The Country of the Blind”