Very soon after 25 BC the urbanization and transformation of the Pessinuntian temple state into a Greek polis began. Constructions such as a Corinthian temple and a colonnaded street ("cardo maximus") were erected with the marble from the quarries located at İstiklalbağı, ca. 6 km north of the city. The boundaries of Pessinus must have been fixed, as were those of the newly founded colony of Germakoloneia (near Babadat), which received part of the area inhabited by the Tolistobogioi. It has been argued that Pessinus and the other Galatian cities received a constitution based on that of the cities in Pontus-Bithynia, imposed by the "lex Pompeia". From the inscriptions it appears that Pessinus possessed several public buildings, including a gymnasium, a theatre, an archive, and baths. A system of water supply has been discovered through gutters and terracotta pipes. The most impressive public construction of the early Imperial period was the canalisation system, the earliest part of which dates from the Augustan age. It was meant to retain and carry away the waters of the Gallos, the seasonal river which traverses Pessinus and which was the main north-south artery ("cardo maximus") of the city. From the 1st to the 3rd century AD the canal was continuously expanded until it finally reached a length of ca. 500 m and a width of 11 to 13 m. It is not known when exactly the large theatre, of which is preserved only the emplacement of the cavea where the spectators were seated, was constructed, but it was repaired or embellished by Hadrian.