During the 1848 Revolutions, the Hungarian insurgents called for the re-unification of Transylvania with Hungary – opposed by Romanian (Wallachian) revolutionaries led by Avram Iancu – but also for the abolition of serfdom. The April Laws of 1848 proclaimed the re-unification, but after the Hungarian revolt was crushed, Transylvania remained under military administration for several years, and the March Constitution of Austria defined the Principality of Transylvania as being a separate crown land that is entirely independent of Hungary.