Bulgarian nationality law is governed by the Constitution of Bulgaria (article 25 and 26) of 1991 and the citizenship law of 1999 (with changes made in various years through to 2009). It is mainly based on jus sanguinis; however, it is possible to obtain citizenship after 5 years of residence in Bulgaria. Naturalisation is available on the basis of residence in certain types of status; marriage or on the basis of origin or at the discretion of the government of Bulgaria to persons of merit. The Bulgarian Ministry of Justice is in charge of processing citizenship applications.