religious significance. Many of the inscriptions have been discovered in hills, rock shelters, and places of local significance. Various theories have been put forward about why Ashoka or his officials chose such places, including that they were centres of megalithic cultures, were regarded as sacred spots in Ashoka's time, or that their physical grandeur may be symbolic of spiritual dominance. Ashoka's inscriptions have not been found at major cities of the Maurya empire, such as Pataliputra, Vidisha, Ujjayini, and Taxila. It is possible that many of these inscriptions are lost; the 7th century Chinese pilgrim Xuanzang refers to some of Ashoka's pillar edicts, which have not been discovered by modern researchers. It appears that Ashoka dispatched every message to his provincial governors, who in turn, relayed it to various officials in their territory. For example, the Minor Rock Edict 1 appears in several versions at multiple places: all the versions state that Ashoka issued the proclamation while on a tour, having spent 256 days on tour. The number 256 indicates that the message was dispatched simultaneously to various places. Three versions of a message, found at edicts in the neighbouring places in Karnataka (Brahmagiri, Siddapura, and Jatinga-Rameshwara), were sent from the southern province's capital Suvarnagiri to various places. All three versions contain the same message, preceded by an initial greeting from the arya-putra (presumably Ashoka's son and the provincial governor) and the mahamatras (officials) in Suvarnagiri. Coinage The caduceus appears as a symbol of the punch-marked coins of the Maurya Empire in India, in the 3rd–2nd century BCE. Numismatic research suggests that this symbol was the symbol of king Ashoka, his personal "Mudra". This symbol was not used on the pre-Mauryan punch-marked coins, but only on coins of the Maurya period, together with the three arched-hill symbol, the "peacock on the hill", the triskelis and the Taxila mark. Modern scholarship Rediscovery Ashoka had almost been forgotten, but in the 19th century James Prinsep contributed in the revelation of historical sources. After deciphering the Brahmi script, Prinsep had originally identified the "Priyadasi" of the inscriptions he found with the King of Ceylon Devanampiya Tissa. However, in 1837, George Turnour discovered an important Sri Lankan manuscript (Dipavamsa, or "Island Chronicle" ) associating Piyadasi with Ashoka: Since then, the association of "Devanampriya Priyadarsin" with Ashoka was confirmed through various inscriptions, and especially confirmed in the Minor Rock Edict inscription discovered in Maski, directly