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If the technology was transported from the future to the age in question, it might be considered time-travel sci-fi. If the technology was developed in the Medieval period independently of temporal...
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Source: https://writers.stackexchange.com/a/33058 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
If the technology was transported from the future to the age in question, it might be considered time-travel sci-fi. If the technology was developed in the Medieval period independently of temporal interference (some mad genius just happened to invent this stuff half a millennia ahead of its time) then it might be labeled as alternate-history, though alternate-history usually deals with the ramifications of tweaks to history.