Sö 278 is yet another runestone fragment used as part of the wall of the cathedral in Strängnäs. The material is brown sandstone.
It’s built into the south wall, right next to the runestone Sö 276, which isn’t one of the Ingvar runestones.
There’s not much left of the inscription of Sö 278. It was probably part of a much larger runestone, and most of it is missing. There used to be a cable bolted to it, but it’s removed now.
ᚴᚢᚾᛒᛁᚢᚱᚾ ᛚᛁᛏ ᚱᛅᛁᛋᛅ ᛬ ᛋᛏ… … …ᚦᛅᚾ ᛅᛁᛘᚢᚾᛏᛁᛦ ᛬
“Gunnbjörn had the stone raised … … son of Amund”