id author title date pages extension mime words sentences flesch summary cache txt en-wikipedia-org-7575 Parthian Empire - Wikipedia .html text/html 21160 2668 72 Before Arsaces I founded the Arsacid Dynasty, he was chieftain of the Parni, an ancient Central-Asian tribe of Iranian peoples and one of several nomadic tribes within the confederation of the Dahae.[15] The Parni most likely spoke an eastern Iranian language, in contrast to the northwestern Iranian language spoken at the time in Parthia.[16] The latter was a northeastern province, first under the Achaemenid, and then the Seleucid empires.[17] After conquering the region, the Parni adopted Parthian as the official court language, speaking it alongside Middle Persian, Aramaic, Greek, Babylonian, Sogdian and other languages in the multilingual territories they would conquer.[18] The Yuezhi Kushan Empire in northern India largely guaranteed the security of Parthia's eastern border.[68] Thus, from the mid-1st century BC onwards, the Arsacid court focused on securing the western border, primarily against Rome.[68] A year following Mithridates II's subjugation of Armenia, Lucius Cornelius Sulla, the Roman proconsul of Cilicia, convened with the Parthian diplomat Orobazus at the Euphrates river. ./cache/en-wikipedia-org-7575.html ./txt/en-wikipedia-org-7575.txt