Catholic social teaching is the body of doctrine developed by the Catholic Church on matters of social justice, involving issues of poverty and wealth, economics, social organization and the role of the state. Its foundations are widely considered to have been laid by Pope Leo XIII's 1891 encyclical letter Rerum novarum, which advocated economic distributism and condemned both capitalism and socialism, although its roots can be traced to the writings of Catholic thinkers such as St. Thomas Aquinas and St. Augustine of Hippo, and is also derived from concepts present in the Bible and the cultures of the ancient Near East.