Oslo is the capital of Norway, and has a population of around 550,000 people. The city was founded in 1049 AD, and has been considered the capital since around 1300. Today the Oslo region has one of the highest per-capita GDPs in Europe, and is one of the most expensive cities in the world to live in, according to recent statistics (see Wikipedia reference).
Oslo is home to the Nobel Peace Price ceremony, as well as one of the largest Telecom companies in the world (Telenor). According to recent migration statistics, Oslo is the fastest growing capital in Scandinavia, due in part to high birth rates and in part to high immigration.