Hagia Sophia has Viking graffiti.

850

On a marble parapet in the upper gallery someone carved the name Halfdan in runes — probably the start of the usual 'Halfdan carved these runes'.

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The event

• Hagia Sophia consecrated537 · Constantinople. Justinian I built in five years a cathedral in Constantinople crowned by a vast dome about 31 m across; for nearly a thousand years it was the largest church in Christendom. After 1453 it became a mosque, in 1934 a museum and in 2020 a mosque again.

9th century

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