Which group is noted for arriving in Ireland from Scandinavia around 800 CE?

The Viking people are known for their arrival in Ireland from Scandinavia around 800 CE. This period marked the beginning of significant Viking activity in Ireland, which included not just raids but also the establishment of trading settlements and, ultimately, some more permanent colonies. Vikings were seafaring Norse warriors and traders primarily from what is now known as Norway and Denmark. Their expeditions throughout Europe led to the founding of several notable cities, including Dublin, which served as a major trading port.

The Norman people and the Saxon people did not arrive in Ireland until later periods. The Normans invaded Ireland in the late 12th century, whereas the Saxons were more associated with early medieval England and did not play a significant role in Irish history compared to the Vikings. The Gaelic tribes are indigenous to Ireland and were already present when the Vikings arrived, so while they may have interacted with the Vikings, they are not noted for having migrated from Scandinavia during the specified timeframe.