I would like to ask a question about El Cid but do not see a tag for the reconquista. Could we add a tag for the reconquista or should I use a different tag for this time period?
I don't consider myself an expert in what makes for a good tag. However, I think a tag should have enough call for its use to justify its existence.
After checking neighboring tags, spain (the most recent 50 of about 130) and islamic-hispania, I only found one other question that would reasonably be better tagged reconquista, were such a tag to exist.
Given that, I'd suggest tagging an El Cid question islamic-hispania, and possibly also spain (depending on the amount of non Al-Andalus content in the question). When/if we one day get a few more questions specifically about the Reconquista, we can readdress the tagging.