On the domestic front, he broke the resistance of the Serbian nobles, and used the periods of peace to strengthen Serbia politically, economically, culturally and militarily. In 1412 he issued the "Code of Mines", with a separate section on governing of Novo Brdo – the largest mine in the Balkans at that time. This code increased the development of mining in Serbia, which had been the main economic backbone of the Serbian Despotate. At the time of his death, Serbia was one of the largest silver producers in Europe. In the field of architecture, he continued development of the Morava school. His reign and personal literary works are sometimes associated with early signs of the Renaissance in the Serbian lands. He introduced knightly tournaments, modern battle tactics, and firearms to Serbia. He was a great patron of the arts and culture by providing shelter and support to scholars and refugees from neighboring countries that had been taken by the Ottomans. In addition, he was himself a writer, and his most important work is "A Homage to Love", which is characterized by the Renaissance lines. During his reign the Resava School was formed.