Emir Ambrus
Emir Ambrus (634-644) also known as Khalid (Arabic) Amr (Coptic) Amrh (Armenian) was the Sadducee-Ishmaelite leader of Tachkastan.
Before he came to power, his Sadducee-Ishmaelite predecessor sent him to conquer the Bakr faction of Al-Hira in 633 forcing the Banu Qabisah to serve him as spies.
After he came to power he led Tachkastan against the Patriarchate of Jerusalem in 634.
During the invasion of Gaza it is said that he forced the Byzantine soldiers to kneel and demanded they renounce Christ or be beheaded.
Sophronius surrendered the Patriarchate to him in 636. He went on to conquer the Patriarchates of Antioch and Alexandria.
He favoured Monophysites and appointed the Monophysite Armenian Patriarch Abraham I as Patriarch of Jerusalem in 638.
He invited the Monophysite Syriac Patriarch John of the Sedre to explain the Christian doctrine to him. As a result he watnted the NT to be translated but without any reference to Jesus a Christ nor to Baptism nor to Crucifixion. In the end he accepted an uncensored translation.
Before he died he considered the Monophysite Coptic Pope Benjamin the holiest man he had ever met and had come to be known by the name Muhmad (Syriac source) or Mahmet (Pahlavi & Armenian sources).
