The decree of Emperor constans ii published in 648 to replace the Ecthesis of the Emperor heraclius of 638. The Holy See, supported by many Byzantine and Latin Christians, had determinedly refused to accept the Ecthesis because of its Monothelite doctrine. Constans, who was faced with the necessity of restoring unity to a Christendom menaced by the Arabs, attempted to effect a compromise through the Typos, which forbade all discussions whatsoever on the subject of one or two wills, one or two operations in Christ. This implied a hidden support of monothelitism. Pope martin i in the Lateran synod of 649 condemned both the Typos and the Ecthesis. He was arrested by order of the Emperor (654) and, after a mock trial and maltreatment in Constantinople, was banished to Cherson in the Crimea. The controversy continued under Martin's successors at Rome, and under Emperor constantine iv, who ultimately summoned the ecumenical Council of constantinople iii (680), which finally condemned Monothelitism.