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Most of the replies are related to Roman stuff, but more 'recent' checkout the Moors: https://en.wikipedia.org/wiki/Moors

They created some amazing architecture and culture in Southern Spain.

The article's record of Spain ends abruptly in the late 7th century, only 4 decades prior to Islamic rule.

So either the Umayyads had no use for camels or Dr Green's research doesn't include records from the period.