<P> The Early Historic material culture of Gujarat include the presence of Northern Black Polished Ware, continued dominance of Black - and - Red Ware, slow introduction and later domination of Red Polished Ware, occurrence of Roman Amphorae, Rangmahal Ware (100--300), introduction of glass and lead, followed by gradual conquest of Iron, an agriculture based economy, shell industry, development of script, rise of the urban settlements, brick structural remains, monumental buildings, international trade and development of Jainism, Buddhism, and Vaishnavism . </P> <P> The excavated sites of the Early Historic period include Dhatva, Jokha, Kamrej, Karvan, Bharuch, Nagal, Timbarva, Akota from South Gujarat; Nagara from central Gujarat; Vadnagar, Shamlaji, Devnimori from north Gujarat and Amreli, Vallabhi, Prabhas Patan, Padri and Dwarka from Saurashtra . </P> <P> Chandragupta Maurya of Maurya dynasty conquered a number of earlier states of Gujarat circa 300 BC . Pushyagupta, a Vaishya, was appointed Governor of Saurashtra by the Mauryan regime . He ruled (322 BC to 294 BC) Girinagar (present Junagadh) and built a dam on the Sudarshan lake . Emperor Ashoka, the grandson of Chandragupta Maurya, not only ordered engraving of his famous edicts on the rock at Junagadh, but asked his Governor Tusherpha to take out canals from the lake where an earlier Mauryan Governor had built a dam . Between the decline of the Mauryan power and Saurashtra coming under the sway of Samprati Mauryas of Ujjain, there was a Greek incursion into Gujarat led by Demetrius.In the first half of the first century A.D. there is the story of a merchant of King Gondaphares landing in Gujarat with Apostle Thomas. The incident of the cup - bearer killed by a lion might indicate that the port city described is in Gujarat . </P> <P> For nearly 300 years from the start of the 1st century AD, Saka rulers played prominent part in Gujarat's history . Weather beaten rock at Junagadh gives a glimpse of the Ruler Rudradaman I (100 AD) of the Saka satraps known as Western Satraps, or Kshatraps . Mahakshatrap Rudradaman I founded the Kardamaka dynasty which ruled from Anupa on the banks of the Narmada up to Aparanta region which bordered Punjab . In Gujarat several battles were fought between the south Indian Satavahana dynasty and the Western Satraps . The greatest ruler of the Satavahana Dynasty was Gautamiputra Satakarni who defeated the Western Satraps and conquered some parts of Gujarat in the 2nd century CE </P>

Who built the sudarshan lake in the saurashtra region