Saint Sava (, , 1174 – 14 January 1236), known as the Illuminator, was a Serbian prince and Orthodox monk, the first Archbishop of the autocephalous Serbian Church, the founder of Serbian law, and a diplomat. Sava, born Rastko, was the youngest son of Serbian Grand Prince Stefan Nemanja (founder of the Nemanjic dynasty), and ruled the appanage of Hum briefly in 1190–92. He then left for Mount Athos where he became a monk, with the name Sava (Sabbas). At Athos, he established the monastery of Hilandar, which became one of the most important cultural and religious centres of the Serbian people. In 1219 he was recognized as the first Serbian Archbishop by the Patriarchate, and in the same year he authored the oldest known constitution of Serbia, Zakonopravilo, thus securing full independence; both religious and political. Sava is regarded the founder of Serbian medieval literature.