"Apart from such spiritual-cultural unity of India depicted in Sangam poems, there is at least one poem that refers to the political unity of India. This poem, from Puranannuru, speaks of a time when the whole of India ‘from Kanyakumari to Himalayas’ was ruled as one nation, unifying the diverse geographical zones of ‘plateaus, mountains, forests and human habitations’ by kings of the solar dynasty, and identifies Tamil kings as descendants of the solar dynasty."