In Sweden, the Riksdag of the Estates existed until it was replaced with a bicameral Riksdag in 1866, which gave political rights to anyone with a certain income or property. Nevertheless, many of the leading politicians of the 19th century continued to be drawn from the old estates, in that they were either noblemen themselves, or represented agricultural and urban interests. Ennoblements continued even after the estates had lost their political importance, with the last ennoblement of explorer Sven Hedin taking place in 1902; this practice was formally abolished with the adoption of the new Constitution January 1, 1975, while the status of the House of Nobility continued to be regulated in law until 2003.