What kind of script is this 'graffiti', carved in Hagia Sophia in Constantinople around 9th century?

Persian
Early Arabic
Armenian
Viking runes
Constantinople, called Miklagard by Vikings, hosted thousands of Vikings and Anglo-Saxons, who served as mercenaries of the Varangian Guard. They were famed for their battlefield skills and fierce, loyalty and drinking. They often fought for the Byzantine Empire, including fights with Arabs.
MarcusX
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Very interesting!
reach: rather globalalphabetsByzantine EmpireConstantinopleculturehistoryhistory of TurkeyMedievalTurkeyVikings

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Persian
Early Arabic
Armenian
Viking runes
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flagGreece
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flagGermany
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flagthe United Kingdom
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flagNew Zealand
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flagAustralia
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flagPoland
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flagPakistan
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flagFrance
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flagUnknown
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flagCanada
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flagthe United States
17%
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22%
30%
250
flagIndia
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21%
30%
33
flagTurkey
23%
23%
30%
15%
13