Even though the last four decades of Pedro II's reign were marked by continuous internal peace and economic prosperity, he had no desire to see the monarchy survive beyond his lifetime and made no effort to maintain support for the institution. The next in line to the throne was his daughter Isabel, but neither Pedro II nor the ruling classes considered a female monarch acceptable. Lacking any viable heir, the Empire's political leaders saw no reason to defend the monarchy. After a 58-year reign, on 15 November 1889 the Emperor was overthrown in a sudden "coup d'état" led by a clique of military leaders whose goal was the formation of a republic headed by a dictator, forming the First Brazilian Republic.