in Central India are also found in the Mālavikāgnimitram, a play by Kālidāsa which describes an encounter between Greek forces and Vasumitra, the grandson of Pushyamitra, during the latter's reign. Also the Brahmanical text of the Yuga Purana, which describes Indian historical events in the form of a prophecy, relates the attack of the Indo-Greeks on the capital Pataliputra, a magnificent fortified city with 570 towers and 64 gates according to Megasthenes, and describes the ultimate destruction of the city's walls: According to the Yuga Purana a situation of complete social disorder follows, in which the Yavanas rule and mingle with the people, and the position of the Brahmins and the Sudras is inverted: Epigraphic remains Several depictions of Greeks in Central India dated to the 2nd-1st century BCE are known, such as the Greek soldier in Bharhut, or a frieze in Sanchi which describes Greek-looking foreigners honouring the Sanchi stupa with gifts, prayers and music (image above). They wear the chlamys cape over short chiton tunics without trousers, and have high-laced sandals. They are beardless with short curly hair and headbands, and two men wear the conical pilos hat. They play various instruments, including two carnyxes, and one aulos double-flute. This is near Vidisa, where an Indo-Greek monument, the Heliodorus pillar, is known. A pillar discovered in Reh, in the Ganges valley 350 km south-east of Mathura mentions Menander: Another inscription 17mk from Mathura, the Maghera inscription, contains the phrase "In the 116th year of the Greek kings...", suggesting Greek rule in the area until around 70 BCE, as the "Greek era" is thought to have started around 186 BCE. Archaeological remains Urban remains The city of Sirkap, today in northwestern Pakistan near Taxila, was built according to the "Hippodamian" grid-plan characteristic of Greek cities, and was a Hellenistic fortress of considerable proportions, with a 6,000 meter wall on the circumference, of a height of about 10 meters. The houses of the Indo-Greek level are "the best planned of all the six strata, and the rubble masonry of which its walls are built is also the most solid and compact". It is thought that the city was built by Demetrius. Artifacts Several Hellenistic artifacts have been found, in particular coins of Indo-Greek kings, stone palettes representing Greek mythological scenes, and small statuettes. Some of them are purely Hellenistic, others indicate an evolution of the Greco-Bactrian styles found at Ai-Khanoum