Rudradaman I
Rudradāman I (r. 130–150) was a Śaka ruler from the Western Kshatrapas dynasty. He was the grandson of the king Caṣṭana. Rudradāman I was instrumental in the decline of the Sātavāhana Empire. Rudradāman I took up the title of "Maha-kshtrapa" ("Great Satrap"), after he became the king and then strengthened his kingdom. Reign. As a result of his victories, Rudradāman regained all the former territories previously held by Nahapana, except for the southern territory of Poona and Nasik. The indigenous Nagas also were aggressive toward Śaka kshatrapas. Sātavāhana dominions were limited to their original base in the  Deccan and eastern central India around Amaravati: War with the Yaudheyas. Rudradāman conquered the Yaudheya tribes in present day Haryana, as described in the Girnar rock inscription of Rudradaman. Rudradaman refers to the Yaudheyas as a militant republic of kshatriyas that confronted him as opposed to submitting: However, the Yaudheyas soon reestablished themselves as independent. Within the next century the warlike Yaudheyas became more powerful. The Yaudheyas were then conquered by the Kushan Empire, who were the suzerains of the Western Kshatrapas, until ultimately by the Gupta Empire. Wars with the Satavahana Dynasty. Rudradāman fought many battles against the Sātavāhanas  (or the Āndhras) and Vashishtiputra Satakarni, the son of the Āndhra king Pulamayi, in an effort to end the hostilities, married the daughter of Rudradāman. The inscription relating the marriage between Rudradāman's daughter and Vashishtiputra Satakarni appears in a cave at Kanheri: Rudradaman maintained matrimonial relationships with Sātavāhanas and conceded the country of Aparanta to Vashishtiputra Satakarni, his son-in-law and younger son of Gautamiputra Satakarni, as dowry. In spite of the matrimonial link, at least two wars took place between them wherein he defeated Sātavāhanas but spared the life of Satakarni (probably, Vashishtiputra Satakarni), essentially because of  their relationship. However, it is not known who was the aggressor in either of the wars and whether there were more wars between them. Other details. The Sanskrit Junagadh inscription dated 150 CE credits Rudradāman I with supporting the cultural arts and Sanskrit literature and repairing the dam built by the Mauryans. He in fact repaired the embankments of the lake Sudarśana, which was constructed by the Mauryas for checking floods. Rudradāman is also known as the king who was ruling when the Greek writer Yavanesvara translated the Yavanajataka from Greek to Sanskrit, which influenced astrology in India. While most  of the scholars, following Rapson believe that Rudradāman ruled from Ujjain, there is no such evidence to support this. In fact, there is evidence to prove the contrary: