Siyavosh Beg (qollar-aghasi)

Siyavosh Beg, also known by his nisba of Bāshīāchūghī (died ca. 1650/51 or 1655), was a Safavid military commander, official, and "gholam" of Georgian origin.
Siyavosh Beg rose through the ranks to become a military officer ("yuzbashi") early on in his career. In 1632, he was appointed as the new governor ("hakem") of Derbent and as commander of the élite "gholam" corps ("qollar-aghasi"), succeeding Khosrow Mirza (later Rostam Khan of Kartli) to this post. He remained commander of the corps for a lengthy period. 
From 1645 to 1649, he served as the governor ("hakem" and "beglarbeg") of Kuhgiluyeh. When in 1645 the re-appointed grand vizier Khalifeh Sultan urged for repressive laws against Isfahan's large Armenian community, the latter turned to Siyavosh Beg, himself a former Christian. 
Like his then incumbent king Abbas II (1642-1666), Siyavosh Beg was an avid drinker. Siyavosh Beg's "nisba" is derived from "Bash-Achuk", a Persian appellation of the Kingdom of Imereti, in western Georgia, where he hailed from.