In 635 Yazdegrd made an alliance with Heracliusagainst the Ercolian-Karaites in Tachkastan.
The Standard Islamic Narrative (SIN) states that Pope Honorius I accepted the Arab religion. In fact he only declared Monothelitism in a letter dated to this year. The Echo or historical kernal behind the SIN indicates the new religion must be Monothelitism which regardless of Church apologetics must therefore only logically mean the "Arian-like" doctrine that the one and only will that Jesus had was a regular human will. It is likely that Pope Honorius was aware of the Saracen raids of 629,630 and 634 and aware that Byzantium was unable to engage in any more wars and that Monothelitism was probably the only practical solution for the time. But Heraclius was Eutychian at heart and was reluctant to abandon his position until it was already too late.
