Vikings in Iberia
The first incursion of the Vikings in Iberia has been characterised as 'probably the most significant episode of the whole period of Viking activity in the South'. It is mentioned in "Annales Bertiniani", and dated August 844, when a group from a plundering expedition entered the Garonne and reached Galicia. Despite storm damage, some proceeded to South-West Spain. This account is consistent with several later, but independent sources in Latin and Arabic. In particular, the late ninth- or early tenth-century "Chronicle of Alfonso III" adds that after plundering a number of coastal villages they were ultimately repulsed in the vicinity of "Farum Brecantium" (i.e. the Tower of Hercules). Ramiro I of Asturias gathered troops in Galicia and Asturia for the counter-attack. After the Asturian victory, the Vikings continued their voyage in direction of Lisbon. While some authors consider that the reliability of this chronicle is open to doubt, others consider that other local chronicles confirm the arrival of the Norsemen.
Viking expansion
Quite extensive evidence for minor Viking raids in Iberia continues for the early eleventh century in later narratives (including some Icelandic sagas) and in northern Iberian charters. As the Viking Age drew to a close, Scandinavians and Normans continued to have opportunities to visit and raid Iberia while on their way to the Holy Land for pilgrimage or crusade, or in connection with Norman conquests in the Mediterranean. Key examples in the saga literature are Sigurðr Jórsalafari (king of Norway 1103-1130) and Røgnvaldr kali Kolsson (d. 1158).