The official separation would only occur on 22 September 1822 in a letter written by Pedro to João VI. In it, Pedro still calls himself Prince Regent and his father is considered the King of the independent Brazil. On 12 October 1822, in the Field of Santana (later known as Field of the Acclamation) Prince Pedro was acclaimed Dom Pedro I, Constitutional Emperor and Perpetual Defender of Brazil. It was at the same time the beginning of Pedro's reign and also of the Empire of Brazil. However, the Emperor made it clear that although he accepted the emperorship, if João VI returned to Brazil he would step down from the throne in favor of his father.