Answer: Chandragupta Maurya with Pushyagupta
Notes: Sudarshan lake was built on orders of Chandragupta Maurya by his governor Pushyagupta in the middle of Urjayant Hill hill at Girnar in Saurashtra. The Junagarh rock inscription of Rudradaman-I says that dam on the Sudarshan lake for irrigation was constructed by Pushyagupta.
