Vikings first arrived in Ireland in the late 8th century, raiding and trading with monasteries along the coast. By 840 CE, they established a permanent settlement on the River Liffey—Dublin—constructing a wooden fort, or longphort, to serve as a base for raids, shipbuilding, and trade. Over the following centuries, they formed alliances, fought battles, and transformed Dublin into a prosperous kingdom and trading hub beyond Scandinavia. Their presence left a lasting impact on Ireland, blending V