Archaeological Museum of Spain in Madrid has especially rich holdings, with two important Imperial Roman statues and many, very fine vases (see below). Other pieces, mostly painted pottery, are in the Louvre, the Antikensammlung Berlin, and other museums in Europe and America. In the case of painted pottery, a number of individual artists, especially from the fourth century BC, have been identified and given notnames whose work has been found in tombs around the city and the region, and sometimes farther afield. It has been presumed that these artists were based in the city. National Archaeological Museum The highlights of the national museum at Paestum are mentioned above: the Sele metopes, the Tomb of the Diver, and the contents of the Heroon. The displays also show a number of large painted terracotta architectural fragments from the temples and other buildings, many Greek terracotta figurines, and incomplete larger terracotta statues, and pottery including painted vases. History Foundation According to Strabo, the city was founded as Poseidonia (named after the Greek deity of the sea) by Greek Achaeans from Sybaris. The colonists had built fortifications close to the sea, but then decided to found the city farther inland at a higher elevation. The fortifications might have been built to the south of Poseidonia on the promontory where Agropoli is now. According to the historical tradition the sanctuary to Poseidon was located there, after which the city would have been named. The date of Poseidonia's founding is not given by ancient sources, but the archaeological evidence gives a date of approximately 600 BC. Alternatively in fact, the Sybarites may have been Troezenians. Aristotle wrote that a group of Troezenians was expelled from Sybaris by the Achaeans after their joint founding of that city. Gaius Julius Solinus calls Paestum a Dorian colony and Strabo mentions that Troezen once was called Poseidonia. As a consequence it has been argued that Paestum was founded by the Troezenians referred to by Aristotle. Another hypothesis is that the Sybarites were aided by Dorians in their founding of Poseidonia. Greek period Archaeological evidence from Paestum's first centuries indicates the building of roads, temples, and other features of a growing city. Coinage, architecture, and molded votive figurines all attest to close relations maintained with Metaponto in the sixth and fifth centuries. It is presumed that Poseidonia harbored refugees from its mother city, Sybaris, when that city was conquered by Croton