He is married to ? ?.
They got married
Child(ren):
BJÖRN, son of HARALD I "Hårfagre/Harfagri/Fairhair" King of Norway & his third wife Svanhild . The Historia Norwegie names "Berno" as fourth son of "Haraldus Comatus", recording that he was reared "in Grenlandia"[232]. Under his father's division of territories, Vingulmark, Raumarike, Vestfold and Thelamark were granted to Olav, Björn, Sigtryg, Frode and Thorgils[233]. King in Vestfold, based at Tunsberg, and "promised to become a good ruler". He promoted merchant expeditions to procure "for himself costly articles", earning himself the nicknames "Farman/Seaman" and "Kaupman/the Chapman" among his brothers. He was killed by retainers of his half-brother Erik after a dispute about who should deliver the tribute from his kingdom to their father. He was buried "in the mound of Farmanshaug at Saeheim"[234].
m ---. Snorre records that Björn "made a good and suitable marriage" but does not name his wife[235].
Björn Haraldsson had one child:
GUDRÖD Bjornsson (-murdered Tunsberg [960/65]).
Bronnen:
[232] Historia Norwegie XI and XV, pp. 80 and 86.
[233] Snorre, Harald Harfager's Saga, 35.
[234] Snorre, Harald Harfager's Saga, 38.
[235] Snorre, Harald Harfager's Saga, 38.
https://fmg.ac/Projects/MedLands/NORWAY.htm#BjornsonHaraldIB