`Abdu'l-Bahá ‘Abdu’l-Bahá (''`Abbás Effendí, was the eldest son of Bahá'u'lláh, the founder of the Bahá'í Faith. In 1892, `Abdu'l-Bahá was appointed in his father's will to be his successor and head of the Bahá'í Faith.His journeys to the West, and his Tablets of the Divine Plan spread the Bahá'í message beyond its middle-eastern roots, and his Will and Testament laid the foundation for the current Bahá'í administrative order.