Trịnh Tráng
His successor, Nguyễn Phúc Nguyên, continued Nguyễn Hoàng's policy of essential independence from the Court in Hanoi. He initiated friendly relations with the Europeans who were now sailing into the area. A Portuguese trading post was set up in Hội An. By 1615 the Nguyễn were producing their own bronze cannons with the aid of Portuguese engineers. In 1620 the emperor was removed from power and executed by Trịnh Tùng. Nguyễn Phúc Nguyên formally announced that he would not be sending any money to the Court nor did he acknowledge the new Emperor as the Emperor of the country. Tensions rose over the next seven years till open warfare broke out in 1627 with the new leader of the Trịnh, Trịnh Tráng.