Montrose (mɒnˈtroʊz ; Mon Rois mɔn ˈrɣɔʃ) is a town and former royal burgh in Angus, Scotland. Situated north of Dundee and south of Aberdeen, Montrose lies between the mouths of the North and South Esk rivers. It is the northernmost coastal town in Angus and developed as a natural harbour that traded in skins, hides, and cured salmon in medieval times. With a population of approximately 12,000, the town functions as a port, but the major employer is GlaxoSmithKline, which was saved from closure in 2006. The skyline of Montrose is dominated by the steeple of Old and St Andrew's Church, designed by James Gillespie Graham and built between 1832 and 1834. Montrose is a town with a wealth of architecture, and is a centre for international trade. It is an important commercial port for the oil and gas industry. It is known for its wide thoroughfare and high street, which leads to picturesque closes containing secluded gardens. The town has a view of a tidal lagoon, Montrose Basin, which is considered a nature reserve of international importance. It is the largest inland salt water basin in the UK, and an important habitat for the mute swan. Just outside Montrose is the 18th-century House of Dun, designed by the Scottish architect William Adam and built in 1730 for David Erskine, Lord Dun, 13th Laird of Dun. Prehistoric elements are found in the vicinity of Montrose, including the Stone of Morphie located to the north. One ancient name for Montrose was Celurca. The place-name is formed from the Scottish Gaelic Moine (meaning moor or peat moss) and Ros (meaning peninsula or promontory), perhaps ultimately of Pictish origin. The first documentary evidence of the existence of Montrose is the burgh charter issued by David I who founded the town around 1140 as Sallorch or Sallork. By 1178 the name had taken the form Munross before becoming Montrose. Folk etymology attributes the origin of the town's name as "Mount of Roses". This is reflected by the motto on the town's seal: Mare ditat, rosa decorat.