<P> The term Sapadalaksha (literally "one and a quarter lakhs" or 125,000) refers to the large number of villages in the area . It became prominent during the Chahamana reign . It appears that the term originally referred to the area around modern Nagaur near Bikaner . This area was known as Savalak (vernacular form of Sapadalaksha) in as late as 20th century . The early Chahamana king Samantaraja was based in Ahichchhatrapura, which can be identified with modern Nagaur . The ancient name of Nagaur was Nagapura, which means "the city of the serpent". Ahichchhatrapura has a similar meaning: "the city whose chhatra or protector is serpent". </P> <P> As the Chahamana territory expanded, the entire region ruled by them came to be known as Sapadalaksha . This included the later Chahamana capitals Ajayameru (Ajmer) and Shakambhari (Sambhar). The term also came to be applied to the larger area captured by the Chahamanas . The early medieval Indian inscriptions and the writings of the contemporary Muslim historians suggest that the following cities were also included in Sapadalaksha: Hansi (now in Haryana), Mandore (now in Marwar region), and Mandalgarh (now in Mewar region). </P> <P> The earliest historical Chahamana king is the 6th century ruler Vasudeva . According to a mythical account in Prithviraja Vijaya, he received the Sambhar Salt Lake as a gift from a vidyadhara (a supernatural being). Little is known about his immediate successors . The 8th century Chahamana ruler Durlabharaja I and his successors are known to have served the Gurjara - Pratiharas as vassals . In 10th century, Vakpatiraja I made an attempt to overthrow the Gurjara - Pratihara suzerainty, and assumed the title Maharaja ("great king"). His younger son Lakshmana established the Naddula Chahamana branch . Vakpatiraja's elder son and successor Simharaja assumed the title Maharajadhiraja ("king of great kings"), which suggests that he was a sovereign ruler . </P> <P> Simharaja's successors consolidated the Chahamana power by engaging in wars with their neighbours, including the Chaulukyas of Gujarat and the Tomaras of Delhi . The dynasty's earliest extant inscription (973 CE) is from the reign of Vigraharaja II . During the reign of Viryarama (r.c. 1040 CE), the Paramara king Bhoja invaded the Chahamana kingdom, and probably occupied their capital Shakambhari for a brief period . Chamundaraja restored the Chahamana power, possibly with the help of the Naddula Chahamanas . </P>

Write the name of two kings of chahamanas dynasty