Altan Khan
In 1576, Altan Khan (1507–1583) of the Tümed Mongols invited the future 3rd Dalai Lama, Sönam Gyatso (1543–1588) to bring Buddhism to Mongolia. After Altan Khan adopted Buddhism, he gave Sönam Gyatso the title Dalai Lama: "Dalai" is the Mongolian translation of the name "Gyatso" "ocean."