Following the earthquake, Joseph I gave his Prime Minister even more power, and Sebastiao de Melo became a powerful, progressive dictator. As his power grew, his enemies increased in number, and bitter disputes with the high nobility became frequent. In 1758 Joseph I was wounded in an attempted assassination. The Tavora family and the Duke of Aveiro were implicated and executed after a quick trial. The Jesuits were expelled from the country and their assets confiscated by the crown. Sebastiao de Melo prosecuted every person involved, even women and children. This was the final stroke that broke the power of the aristocracy. Joseph I made his loyal minister Count of Oeiras in 1759.
Try to answer this question if possible (otherwise reply "unanswerable"): In what year did Joseph I make his minister the Count of Oeiras?
1759