Analysis of information sources in references of the Wikipedia article "Norse–Gaels" in English language version.
The Gallgaedil of 12th-century Galloway appear to have been predominantly Gaelic-speakers...remained a people separate from the Scots...Their separateness seems to have been established not by language but by their links with Man, Dublin, and the Innsi Gall, the Hebrides: they were part of a Hiberno-Norse Irish-Sea world
Rathlin Island is the site of the first recorded Viking attack on Ireland in 795 AD. A number of Viking graves, some with magnificent grave goods, and a Hiberno-Norse coin hoard from the 1040's has been found here