In the 9th century, Viking invasions led to the destruction of Dál Riata and its replacement by the Norse Kingdom of the Isles, which became part of the kingdom of Norway following Norwegian unification around 872. The Kingdom of the Isles was much more extensive than Dál Riata, encompassing also the Outer Hebrides and Skye. The island kingdom became known as the "Suðreyjar", meaning "southern isles" in Old Norse. The former lands of Dál Riata acquired the geographic description "Argyle" (now "Argyll"): the "Gaelic coast".