So here’s the thing: we don’t actually know if the Battle of Guadalete took place on July 19, 711. It’s sort of a best guess. Historian David Lewis, who has written on Islamic Spain among many other topics, puts Guadalete on this date, and who am I to argue with him? Hugh Kennedy writes in his Muslim Spain and Portugal that the battle “seems to have lasted for a number of days around 20 July 711,” and this is a date around 20 July, so that seems good enough for our purposes.
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