there was the situation in moorish spain and not much else, and even that is barely an arab initiative, be it given the role of berbers or especially hispanic converts. in fact it's been discovered the infamous arab base at fraxinetum in provence which launched raids as far as the alps and the rhineland was manned by christian spanish subjects of the caliphate. these were from the spanish levant, a zone which before and after islam has been known as restive and a pirates' nest. the more you look into spain especially at a regional level, the more you uncover the degree of continuity as opposed to rupture in spite of the radically different creeds of different centuries. that's because the indigenous peoples were the main actors all along. as for later centuries, there is the barbary slave trade of maghreb port towns, but even this is contentious as this was in an ottoman context and the actors at play were overwhelmingly freshly converted greeks, albanians or even westerners.
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