"as Troy was because of Helen, and Spain because of La Cava, although on better grounds"

   According to the pseudo-historical traditions of both Spanish and Arabic scholarship, the Moorish occupation of Iberia in the 8th century AD was made possible by the betrayal of a Christain leader commonly called 'Julian'.  The Count of Ceuta, a strategically important city on the African side of the Strait of Gibraltar which became a primary staging ground for the invasion, legend has it that his defection resulted from an affair between Roderic - the last Visigothic King of Hispania - and his young daughter.  In spite of the many complex  political forces behind the invasion, and regardless of whether or not she actually existed, the girl was thereafter immortalised in Spanish folklore as the archetypal wicked seductress 'La Cava'. 

Online edition of 9th-century historian Ibn Abd-el-Hakam's 'History of the Conquest of Spain', translated by John Harris Jones (1858)

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