King of Vestfold, Agdir, Raumarike, and Sogn (827-860), d. ca. 860
MISC: He passed rulership of his three small domains in eastern, central, and western Norway to his son, Harald.
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Following Information copied from Wayne Iverson, World Connect db=wiversrm, rootsweb.com
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Also recorded as king from 830-870 who first married Ragnhild, daughter of King Harald Gullskiegg of Sogn.
Halfdan was a year old when his father died.
He died by drowning after breaking through the ice while driving home from a feast across the Randsfjord. He was so popular that the leading men agreed to divide his body into four parts to be buried in four districts, Ringerike, Romerike, Westfold and Heithmork. The head or trunk of the body was buried at Stein, Ringerike where there still is a mound named for him.