Göta älv
Duke Erik also held Bohuslän from Norway as well as northern Halland and was creating a separate kingdom centered on Göta älv. In 1317 however, Birger captured his brothers during the Nyköping Banquet ("Nyköpings gästabud"), which led to their death. According to Eric's Chronicle ("Erikskrönikan"), the dukes were starved to death in a cellar of Nyköping Castle.