South of , Gaelic place names are more common, and after the 13th century, Gaelic became the main language of the entire Hebridean archipelago. Due to Scots and English being favoured in government and the educational system, the Hebrides have been in a state of diglossia since at least the 17th century. The Highland Clearances of the 19th century accelerated the language shift away from Scottish Gaelic, as did increased migration and the continuing lower status of Gaelic speakers. Nevertheless, as late as the end of the 19th century, there were significant populations of monolingual Gaelic speakers, and the Hebrides still contain the highest percentages of Gaelic speakers in Scotland. This is especially true of the Outer Hebrides, where a slim majority speak the language. The Scottish Gaelic college, , is based on Skye and Islay.