Wikipedia
Ecthesis
The Ecthesis is a letter published in 638 CE by the Byzantine emperor Heraclius which defined monotheletism as the official imperial form of Christianity.
Usage examples of "ecthesis".
This law of silence was successively imposed by the ecthesis or exposition of Heraclius, the type or model of his grandson Constans.
As the representative of the Western church, Pope Martin and his Lateran synod anathematized the perfidious and guilty silence of the Greeks: one hundred and five bishops of Italy, for the most part the subjects of Constans, presumed to reprobate his wicked type, and the impious ecthesis of his grandfather.
This law of silence was successively imposed by the ecthesis or exposition of Heraclius, the type or model of his grandson Constans.