イヴァン・アセン2世
The two earliest Bulgarian royal charters, the Vatopedi Charter given to the Vatopedi monastery on Mount Athos, and the Dubrovnik Charter which permitted Ragusan merchants to trade all over the Bulgarian lands, were issued by Tsar Ivan Asen II of Bulgaria after 1230, and are both undated. The Vatopedi Charter was discovered on Mount Athos in 1929 and the Dubrovnik Charter was found in the archives of Dubrovnik in 1817.