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In page Kingdom of Asturias:

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The Vikings invaded Galicia in 844, but were decisively defeated by Ramiro I at Corunna.[1] Many of the Vikings' casualties were caused by the Galicians' ballistas – powerful torsion-powered projectile weapons that looked rather like giant crossbows.[1][2] Seventy of the Vikings' longships were captured on the beach and burned.[1][3][4] A few months later, another fleet took Seville. The Vikings found in Seville a population which was still largely Gothic and Romano-Spanish.[5] The Gothic elements were important in the Andalusian emirate.[6] Musa ibn Musa, who took a leading part in the defeat of the Vikings at Tablada, belonged to a powerful Muwallad family of Gothic descent.[citation needed]