Ranrike (Old Norse Ránríki) was the old name for a part of Viken, corresponding to southeast Norway (Oslofjord area) and the northern half of the modern Swedish (Norwegian until 1658) province of Bohuslän (roughly identical with Álfheimr of Scandinavian mythology). When folklore and culture is concerned the usage has been revived to refer to northern Bohuslän.
Tryggve Olafsson (Old Norse: Tryggvi Óláfsson; Norwegian: Tryggve Olavsson; born c. 928 in Ringerike – died c. 963 in Sotnes, Bohuslän, Västra Götaland, Sweden) was the king of Viken, Norway (Vingulmark and Rånrike).
Olaf Tryggvason (960s – 9 September 1000) was King of Norway from 995 to 1000. He was the son of Tryggvi Olafsson, king of Viken (Vingulmark, and Rånrike), and, according to later sagas, the great-grandson of Harald Fairhair, first King of Norway. He is numbered as Olaf I.
Olaf was important in the conversion of the Norse to Christianity, but he did so forcibly within his own kingdom. He is said to have built the first Christian church in Norway in 995, and to have founded the city of Trondheim in 997. A statue dedicated to him is located in the city's central plaza.