A political revolution erupted in Portugal in 1820, forcing the royal family to return. John VI's heir, Pedro, Prince of Brazil, remained in Brazil. In 1821, the Portuguese Assembly demanded Brazil to return to its former condition of colony and the return of the heir prince to Portugal. Pedro, influenced by the Rio de Janeiro Senate ("Senado da Câmara") refused to return on 9 January 1822, a date which became known as "Dia do Fico" (I'll Stay Day).