Vikings in Iberia
Viking activity in the Iberian peninsula seems to have begun around the mid-ninth century as an extension of Viking raids on and establishment of bases in Frankia in the earlier ninth century. While connections between the Norse and Eastern Islamic lands were well-established, particularly involving the Rus') along the Volga and around the Caspian Sea, relations with the Western edge of Islam were more sporadic and haphazard. Although Vikings may have over-wintered in Iberia, no evidence has been found for trading or settlement. Indeed, the Iberian peninsula may not have offered particularly wealthy targets, in the ninth to tenth centuries. Sporadic raiding continued until the end of the Viking Age.
Viking Age in Estonia
The Viking Age in Estonia was a period in the history of Estonia, part of the Viking Age (793–1066 AD). It was not a unified country at the time, and the area of Ancient Estonia was divided among loosely allied regions. It was preceded by the Bronze and Early Iron Ages in Estonia, during which an agrarian society had developed, the Migration Period (450–550 AD), and Pre-Viking Age (550–800 AD) with the Viking Age itself lasting between 800–1050 AD. It is often considered to be part of the Iron Age period which started around 400 AD and ended around 1200 AD, soon after Estonian Vikings were recorded in the "Eric Chronicles" to have sacked Sigtuna in 1187.