Which Norwegian king is traditionally credited with unifying Norway in the late 9th century?

Harald Fairhair is the Norwegian king traditionally credited with unifying Norway in the late 9th century.

According to medieval Icelandic sagas, Harald became determined to bring the country’s smaller kingdoms under his rule after making a vow connected with Gyda, a woman he wished to marry. His victory at the Battle of Hafrsfjord is commonly dated to about 872 and is presented as a decisive step in the unification of Norway.

Modern historians treat the story cautiously. Norway was probably consolidated gradually, and the surviving saga accounts were written centuries after Harald’s lifetime. The exact scale and date of his control remain debated, although Harald is firmly established in Norwegian historical tradition.

He is also called Harald Hårfagre in Norwegian. Later rulers such as Olaf Tryggvason and Haakon the Good belonged to the same broader royal history but are not the traditional answer to the unification question.