Aberdeen is Scotlands third most populous city, one of Scotlands 32 local government council areas and the United Kingdoms 37th most populous built-up area, with an official population estimate of 196,670 for the city of Aberdeen Nicknames include the Granite City, the Grey City and the Silver City with the Golden Sands. During the mid-18th to mid-20th centuries, Aberdeens buildings incorporated locally quarried grey granite, which can sparkle like silver because of its high mica content. The area around Aberdeen has been settled since at least 8,000 years ago, when prehistoric villages lay around the mouths of the rivers Dee and Don. The city has a long, sandy coastline and a marine climate, the latter resulting in chilly summers and mild winters. Aberdeen received Royal Burgh status from David I of Scotland , Aberdeen has won the Britain in Bloom competition a record-breaking ten times, and hosts the Aberdeen International Youth Festival, a major international event which attracts up to 1000 of the most talented young performing arts companies. In 2015, Mercer named Aberdeen the 57th most liveable city in the world, as well as the fourth most liveable city in Britain. In 2012, HSBC named Aberdeen as a leading business hub and one of eight super cities spearheading the UKs economy, marking it as the only city in Scotland to receive this accolade.