Tachkastan
Tachkastan (also known as Tashik in Tang Chinese and Tayyaye in Syriac) was an Arab State from the time of the Battle of Dhi Qar until 692CE. It was situated in Al-Jazizah, Iraq between the Persian and Roman Empires. Sebeos tells us that it was a desert where the Edessan Jews were sent by Heraclius. In Tachkastan the exiled Edessan Jews met certain Ishmaelites (Sadducees). The Edessan Jews tried to establish a politcal alliance with the Ishmaelite-Sadducees they met in Tachkastan. However, they were unable to make any progress until an Ishmaelite-Sadducee called Mahmet (Amrh) rose to prominence. Tachkastan's Manichean polity had a couple of Sadducee rulers among its Kings which included:
- Hani ibn Qabisa d.628
- Hormizd of Nisibis 4 yrs. d.632
- Emir Ambrus 12yrs. d.644
- King Tashik 12yrs. d.656
Tachkastan was consumed by 36 years of Fitna until 692 when Abdul Malik ibn Marwan conquered Abdallah ibn Al-Zubayir and turned it into the Umyyad Caliphate.
According to a concordant synthesis of passages of the Arab-Byzantine Chronicle and the Diary of Egeria, the original "Makah" was located where Rome, Persia and Chaldea met indicating that Chaldea was to or in the North of Tachkastan.
