illustrator Alexey Astankov realized this interesting step by step oveview showing how European castles have been built and evolved throughout history https://www.artstation.com/artwork/Ao5lX pic.twitter.com/Ol9C3NHU4O
This is very pleasing, but stone keeps were still exceptionally rare in 980.
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According to Wikipedia and its sources, during the 10th century, a small number of stone keeps began to be built in France [https://buff.ly/2Twl4Se ], so maybe the author considered this reference for starting the stone keep visualization
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That probably should be 1080, it's the prototypical Norman keep.
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