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 ### Halfdan was here###🥳