Nottinghamshire lies on the Roman Fosse Way, and there are Roman settlements in the county; for example at Mansfield, and forts such as at the Broxtowe Estate in Bilborough. The county was settled by Angles around the 5th century, and became part of the Kingdom, and later Earldom, of Mercia. However, there is evidence of Saxon settlement at the Broxtowe Estate, Oxton, near Nottingham, and Tuxford, east of Sherwood Forest. The name first occurs in 1016, but until 1568, the county was administratively united with Derbyshire, under a single Sheriff. In Norman times, the county developed malting and woollen industries. During the industrial revolution, the county held much needed minerals such as coal and iron ore, and had constructed some of the first experimental waggonways in the world; an example of this is the Wollaton wagonway of 1603–1616, which transported minerals from bell pitt mining areas at Strelley and Bilborough, this led to canals and railways being constructed in the county, and the lace and cotton industries grew. In the 18th and 19th centuries, mechanised deeper collieries opened, and mining became an important economic sector, though these declined after the 1984–85 miners' strike.