 Complete the following phrase:  The founding date of the Bukhar Khudahs remains unknown; the 10th-century Iranian historian Narshakhi is known to have mentioned several names of rulers of Bukhara, but it is not known if they were all from the same dynasty. The first ruler mentioned by Narshakhi is Abrui also spelled Abarzi. According to Narshakhi, he was a cruel ruler, who was overthrown by a certain Turkic king named Qara Jurjin. The next ruler is named Kana, who is said to have introduced the minting of coins in Bukhara, which is, however, doubted by modern scholars. The next ruler is given as Makh, who was credited with the building of a bazaar that was named after him. The first ruler mentioned with the title of Bukhar Khudah is named Bidun, who was killed in 681 by the Umayyad general Salm ibn Ziyad during the first Arab attempts to 