In 1830, the Belgian revolution took place in Brussels after a performance of Auber’s opera La Muette de Portici at the La Monnaie theatre. Brussels became the capital and seat of government of the new nation. South Brabant was renamed simply Brabant, with Brussels as its capital. On 21 July 1831, Leopold I, the first King of the Belgians, ascended the throne, undertaking the destruction of the city walls and the construction of many buildings. Following independence, the city underwent many more changes. The Senne had become a serious health hazard, and from 1867 to 1871 its entire course through the urban area was completely covered over. This allowed urban renewal and the construction of modern buildings and boulevards characteristic of downtown Brussels today.