A few weeks ago, I looked out on the Cathedral of Monreale from the platform on which once stood the throne of William II, King of Sicily. From there nearly two acres of richly coloured mosaics were visible, glittering with gold. In the apse behind was the majestic figure of Christ Pantocrator — that is, almighty. The walls of the aisles and nave were lined with scenes from the Bible. In another panel, just above, Christ himself crowned King William.
It was a prospect of the greatest opulence and sophistication stretching in every direction from this regal vantage point. The mosaics are in the manner of Byzantium, and probably executed by Greek artists, but the architectural plan and inlaid floors are derived from medieval Italy. This then, Padre Nicola Gaglio, the priest who was escorting us pointed out, was a building in which the Christian traditions of East and West, Rome and Constantinople, were combined and contrasted.
That’s true. But what is extraordinary is that that list does not by any means exhaust the interaction of civilisations that took place in 12th-century Sicily, soon to be explored in an exhibition at the British Museum. For a century after the conquest of the island by Norman forces in the 11th century, Sicilian society deserved the contemporary term multicultural.
The island was also quadrilingual, as an inscribed stone from 12th-century Palermo demonstrates. This inscription recorded the transfer of the remains of one Anna, mother of a priest called Grisandus, to a private chapel. It does so, however, in Latin, Greek, Arabic and Judaeo-Arabic (an Arabic dialect written in Hebrew characters for an Arabic-speaking Jewish population). Each text is slightly different, since — for example — the stone is dated 1149, according to western Christian chronology, 6657 according to the Byzantines, who began at the creation of the world, and 544 by Islamic reckoning.

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