'''Tachkastan''' (also known as '''Tashik''' in Tang Chinese and '''Tayyaye''' in Syriac '''Tayy''' in Arabic Tazigan/Tashih/Tachk/Tajik) was originally at first primarily a '''[[Hanif Tsabi|Persian Christian]] Erev Rav''' state in the Iraqi desert which gained independence under the leadership of a [[Messianic Noahite ]] faction at the battle of Dhi Qar in 622 (the year of the Arabs) and grew into the Umayyad Caliphateby the end of the 7th century CE. Its capital was in the province of [[Orientalis]] otherwise known as Al-Jazizah, Iraq between the Persian and Roman Empires. Sebeos tells us that it was to this desert-state that the [[Jews of Edessa]] were sent by Heraclius soon after his victory over Khosrau II in 628. In Tachkastan the exiled Edessan Jews were welcomed by certain Edomean-Ishmaelite believers in Judaism who they Jews were unable to rally to their cause until a new leader rose to power in 634.
Many Edomeans and Ishmaelites had been converted into Jews and Sadducees from Hasmonean times (under John Hyrcanus and John Alexander) as well as under the Himyarite Kingdom where they adopted the Judeo-Arabic term MHMD for the Mem Tet (Messiah ben Joseph) of the Mahamadim described in the Shiur Qomah.
