 Glasgow is also known for the Glasgow patter, a distinct dialect of the Scots language that is noted for being difficult to understand by those from outside the city.Glasgow grew from a small rural settlement on the River Clyde to become the largest seaport in Scotland, and tenth largest by tonnage in Britain.Expanding from the medieval bishopric and royal burgh, and the later establishment of the University of Glasgow in the fifteenth century, it became a major centre of the Scottish Enlightenment in the eighteenth century.