 ʻAbbás Effendi was Baháʼu'lláh's eldest son, known by the title of ʻAbdu'l-Bahá (Servant of Bahá).His father left a will that appointed ʻAbdu'l-Bahá as the leader of the Baháʼí community, and designated him as the "Centre of the Covenant", "Head of the Faith", and the sole authoritative interpreter of Baháʼu'lláh's writings.ʻAbdu'l-Bahá had shared his father's long exile and imprisonment, which continued until ʻAbdu'l-Bahá's own release as a result of the Young Turk Revolution in 1908.