Cao Dai (Cao Đài) is a relatively new, syncretist, monotheistic religion, officially established in Tay Ninh, southern Vietnam, in 1926. Đạo Cao Đài is the religion's shortened name, the full name is Đại Đạo Tam Kỳ Phổ Độ (Great Religion [of The] Third Period [of] Revelation [and] Salvation).