Agatho Pope, surnamed Thaumaturgus, on account of his pretended gift of working miracles. He was a native of Palermo, in Sicily. On the 27th of June, 678, he was elected pope on the death of Donus. He is remembered mainly for his efforts against the Monothelite heresy. Chiefly by his instrumentality the 6th and last Ecumenical Council was assembled in 680 at Constantinople against these opinions, to which he sent four legates; and at that council the doctrine sanctioned by Pope Honorius was renounced by Pope Agatho — infallibility against infallibility. He died January 10th, 682. His letters against the Monothelites are preserved in the records of the 6th council (Hardouin, Concilia, tom. 3).