São Toméan nationality law is regulated by the Constitution of São Tomé and Príncipe, as amended; the Nationality Law, and its revisions; and various international agreements to which the country is a signatory. These laws determine who is, or is eligible to be, a national of São Tomé and Príncipe. The legal means to acquire nationality, formal legal membership in a nation, differ from the domestic relationship of rights and obligations between a national and the nation, known as citizenship. Nationality describes the relationship of an individual to the state under international law, whereas citizenship is the domestic relationship of an individual within the nation. São Toméan nationality is typically obtained under the principles of jus soli, i.e. by birth in the territory, or jus sangu