Alexander, which seems to be a token of his Indian conquests. Bopearachchi believes that Demetrius received the title of "King of India" following his victories south of the Hindu Kush. He was also given, though perhaps only posthumously, the title ("Aniketos", lit. Invincible) a cult title of Heracles, which Alexander had assumed; the later Indo-Greek kings Lysias, Philoxenus, and Artemidorus also took it. Finally, Demetrius may have been the founder of a newly discovered Yavana era, starting in 186/5 BC. First bilingual and multi-religion monetary system After the death of Demetrius, the Bactrian kings Pantaleon and Agathocles struck the first bilingual coins with Indian inscriptions found as far east as Taxila so in their time (c. 185–170 BC) the Bactrian kingdom seems to have included Gandhara. These first bilingual coins used the Brahmi script, whereas later kings would generally use Kharoshthi. They also went as far as incorporating Indian deities, variously interpreted as Hindu deities or the Buddha. They also included various Indian devices (lion, elephant, zebu bull) and symbols, some of them Buddhist such as the tree-in-railing. These symbols can also be seen in the Post-Mauryan coinage of Gandhara. The Hinduist coinage of Agathocles is few but spectacular. Six Indian-standard silver drachmas were discovered at Ai-Khanoum in 1970, which depict Hindu deities. These are early Avatars of Vishnu: Balarama-Sankarshana with attributes consisting of the Gada mace and the plow, and Vasudeva-Krishna with the Vishnu attributes of the Shankha (a pear-shaped case or conch) and the Sudarshana Chakra wheel. These first attempts at incorporating Indian culture were only partly preserved by later kings: they all continued to struck bilingual coins, sometimes in addition to Attic coinage, but Greek deities remained prevalent. Indian animals however, such as the elephant, the bull or the lion, possibly with religious overtones, were used extensively in their Indian-standard square coinage. Buddhist wheels (Dharmachakras) still appear in the coinage of Menander I and Menander II. Several Bactrian kings followed after Demetrius' death, and it seems likely that the civil wars between them made it possible for Apollodotus I (from c. 180/175 BC) to make himself independent as the first proper Indo-Greek king (who did not rule from Bactria). Large numbers of his coins have been found in India, and he seems to have reigned in Gandhara as well as western Punjab. Apollodotus I was succeeded by or ruled alongside Antimachus II, likely the son of the