Yohannes I (Ge'ez: ቀዳማዊ ዮሐንስ qädamawi yōḥānnis, Amh. qädamawi yōhānnis, also sometimes called John I), throne name A'ilaf Sagad (Ge'ez: አእላፍ ሰገድ a'ilāf sagad, "to whom tens of thousands bow"), (c. 1640 – 19 July 1682) was Emperor (nəgusä nägäst) (1667–1682) of Ethiopia, and a member of the Solomonic dynasty. He was the fourth son of Fasilides.
The growing controversy over the nature of Christ had grown severe enough that in the last year of his reign Yohannes called a synod to resolve the dispute. The Ewostathian monks of Gojjam advocated the formula "Through Unction Christ the Son was consubstantial with the Father", by which they came to be known as the Qebat ("Unction") faction, who were supported by the Emperor's own son Iyasu; they were opposed by the monks of Debre Libanos, who at that time still advocated traditional Miaphysitism. The outcome of the synod is in dispute: according to E.A. Wallis-Budge and H. Weld Blundell, Emperor Yohannes was convinced to condemn the Qebat doctrine, which led to Iyasu attempting to flee his father's realm; but according to Crummey, Yohannes favored the Gojjame delegation for political reasons: at the time Gojjam was an important province. These decisions were revisited once Iyasu became Emperor, at a synod he called in 1686.
Source: Yohannes I - Wikipedia
The growing controversy over the nature of Christ had grown severe enough that in the last year of his reign Yohannes called a synod to resolve the dispute. The Ewostathian monks of Gojjam advocated the formula "Through Unction Christ the Son was consubstantial with the Father", by which they came to be known as the Qebat ("Unction") faction, who were supported by the Emperor's own son Iyasu; they were opposed by the monks of Debre Libanos, who at that time still advocated traditional Miaphysitism. The outcome of the synod is in dispute: according to E.A. Wallis-Budge and H. Weld Blundell, Emperor Yohannes was convinced to condemn the Qebat doctrine, which led to Iyasu attempting to flee his father's realm; but according to Crummey, Yohannes favored the Gojjame delegation for political reasons: at the time Gojjam was an important province. These decisions were revisited once Iyasu became Emperor, at a synod he called in 1686.
Source: Yohannes I - Wikipedia