The name Varanasi, has its origin possibly from the names of the two rivers Varuna and Assi for it lies with the confluence of Varuna with the Ganges being to its north and that of Assi and the Ganges to its south.Another speculation about the origin of the name is that the river Varuna itself was called Varanasi in olden times, from where the city got its name. Through the ages,Varanasi was variously known as Avimuktaka, Anandakanana, Mahasmasana, Surandhana, Brahma Vardha, Sudarsana, Ramya, and Kasi. In the Rigveda, the city was referred to as Kasi or Kashi, "the luminous one" as an allusion to the city's historical status as a center of learning, literature, and culture. Kasikhanda described the glory of the city in 15,000 verses in the Skanda Purana. In one verse, God Shiva says, The three worlds form one city of mine, and Kasi is my royal palace therein.