was a Roman colony in Muziris. Great "floods" of Periyar Muziris disappeared from every known map of antiquity, and without a trace, presumably because of a cataclysmic event in 1341, a "cyclone and floods" in the Periyar that altered the geography of the region. The historians Rajan Gurukkal and Dick Whittakker say in a study titled "In Search of Muziris" that the event, which opened up the present harbour at Kochi and the Vembanad backwater system to the sea and formed a new deposit of land now known as the Vypeen Island near Kochi, "doubtless changed access to the Periyar river, but geologically it was only the most spectacular of the physical changes and land formation that have been going on [there] from time immemorial". According to them, for example, a geophysical survey of the region has shown that 200–300 years ago the shoreline lay about three kilometres east of the present coast and that some 2,000 years earlier it lay even further east, about 6.5 km inland. "If Muziris had been situated somewhere here in Roman times, the coast at that time would have run some 4-5 km east of its present line. The regular silting up of the river mouth finally forced it to cease activity as a port." Archaeological excavations A series of excavations conducted at Kodungallur starting from 1945, yielded nothing that went back to before the 13th century. Another excavation was carried out in 1969 by the Archaeological Survey of India at Cheraman Parambu, 2 km north of Kodungallur. Only antiquities of the 13th and 16th century were recovered. In 1983, a large hoard of Roman coins was found at a site around six miles from Pattanam. A series of pioneering excavations from 2007 carried out by the Kerala Council for Historical Research (KCHR, an autonomous institution) at Pattanam uncovered a large number of artifacts. So far, seven seasons of excavations (2007–14) have been completed by KCHR at Pattanam. The identification of Pattanam as Muziris is a divisive subject among some historians of South India. When KCHR announced the possible finding of Muziris based on Pattanam finds, it invited criticism from historians and archaeologists. Historians such as R Nagaswamy, KN Panikkar and MGS Narayanan disagreed with the identification and called for further analysis. "Whether Pattanam was Muziris is not of immediate concern to us", the chief of the Kerala Council for Historical Research recently stated