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.
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MarcusX
reach: rather globalalphabetsByzantine EmpireConstantinopleculturehistoryhistory of TurkeyMedievalTurkeyVikings
Persian
Early Arabic
Armenian
Viking runes
answers
flagUkraine
9%
6%
3%
75%
33
flagDenmark
7%
10%
7%
75%
28
flagSwitzerland
4%
4%
19%
71%
21
flagAustria
3%
22%
11%
62%
27
flagthe United Kingdom
16%
12%
15%
55%
310
flagSpain
14%
17%
14%
50%
28
flagPoland
17%
17%
16%
48%
11885
flagCanada
23%
15%
15%
46%
39
flagGermany
13%
17%
22%
45%
180
flagthe Netherlands
26%
15%
15%
42%
38
flagNorway
11%
19%
26%
42%
26
flagBelgium
14%
14%
23%
42%
21
flagTurkey
14%
21%
7%
39%
28
flagUnknown
19%
23%
17%
38%
446
flagSweden
11%
33%
16%
38%
18
flagItaly
27%
13%
20%
37%
29
flagthe United States
20%
25%
17%
34%
317
flagFrance
18%
12%
34%
31%
32
flagRepublic of Ireland
34%
11%
25%
28%
35
flagIndia
17%
21%
32%
28%
28