played an active role in the propagation of Buddhism, as some of the emissaries of Ashoka such as Dharmaraksita, or the teacher Mahadharmaraksita, are described in Pali sources as leading Greek ("Yona", i.e., Ionian) Buddhist monks, active in Buddhist proselytism (the Mahavamsa, XII). It is also thought that Greeks contributed to the sculptural work of the Pillars of Ashoka, and more generally to the blossoming of Mauryan art. Some Greeks (Yavanas) may have played an administrative role in the territories ruled by Ashoka: the Junagadh rock inscription of Rudradaman records that during the rule of Ashoka, a Yavana King/ Governor named Tushaspha was in charge in the area of Girnar, Gujarat, mentioning his role in the construction of a water reservoir. Again in 206 BC, the Seleucid emperor Antiochus led an army to the Kabul valley, where he received war elephants and presents from the local king Sophagasenus: Greek rule in Bactria Alexander had also established several colonies in neighbouring Bactria, such as Alexandria on the Oxus (modern Ai-Khanoum) and Alexandria of the Caucasus (medieval Kapisa, modern Bagram). After Alexander's death in 323 BC, Bactria came under the control of Seleucus I Nicator, who founded the Seleucid Empire. The Greco-Bactrian Kingdom was founded when Diodotus I, the satrap of Bactria (and probably the surrounding provinces) seceded from the Seleucid Empire around 250 BC. The preserved ancient sources (see below) are somewhat contradictory and the exact date of Bactrian independence has not been settled. Somewhat simplified, there is a high chronology (c. 255 BC) and a low chronology (c. 246 BC) for Diodotos' secession. The high chronology has the advantage of explaining why the Seleucid king Antiochus II issued very few coins in Bactria, as Diodotos would have become independent there early in Antiochus' reign. On the other hand, the low chronology, from the mid-240s BC, has the advantage of connecting the secession of Diodotus I with the Third Syrian War, a catastrophic conflict for the Seleucid Empire. The new kingdom, highly urbanized and considered one of the richest of the Orient (opulentissimum illud mille urbium Bactrianum imperium "The extremely prosperous Bactrian empire of the thousand cities" Justin, XLI,1), was to further grow in power and engage into territorial expansion to the east and the west: When the ruler of neighbouring Parthia, the former satrap and self-proclaimed king Andragoras, was eliminated by Arsaces, the rise of the Parthian Empire cut off