Runic inscriptions in Hagia Sophia
There are at least two runic inscriptions in Hagia Sophia's marble parapets. They may have been engraved by members of the Varangian Guard in Constantinople in the Viking Age. The Halfdan inscription. The first runic inscription was discovered in 1964 on a parapet on the top floor of the southern gallery, and the discovery was published by Elisabeth Svärdström in "Runorna i Hagia Sofia", "Fornvännen" 65 (1970), 247-49. The inscription is worn down so nowadays only "-ftan", which is the Norse name "Halfdan", is legible. The remainder of the inscription is considered to  be illegible, but it is possible that it followed the common formula "NN carved these runes". The second inscription. A second inscription was discovered by Folke Högberg from Uppsala in 1975. It was discovered in a niche in the northern part of the same gallery as the first inscription. The discovery was reported to the Department of Runes in Stockholm in 1984, but it was not published. The archaeologist Mats G. Larsson discovered the runes anew in 1988 and published the find in "Nyfunna runor i Hagia Sofia", "Fornvännen" 84 (1989), 12-14. He read "ari:k" and interpreted it  as a possible "Ári m(ade)" or "Ári m(ade the runes)". Because of the uncertainty in the reading, the inscription was not registered in the periodical "Nytt om runer 4" of 1989. Högberg had made a different reading from Larsson in 1975, and this reading was supported by Svein Indrelid, who is a professor of archaeology at the University of Bergen in 1997. The reading of Högberg and Indrelid is the man's name "Árni" and they consider the inscription to be pure graffiti, unlike Larsson. The latter learnt of Högberg's interpretation in 1989, but he defended his own interpretation . More inscriptions. Professor Indrelid made copies of five possible runic inscriptions on the parapet and he handed them over to the Norwegian Runic archive in 1997. There may be additional runic inscriptions waiting to be found on the walls and other parts of the Hagia Sophia.