This later Vedic Age witnessed the emergence of towns, both as political centers and commercial centers. Traders evolved from the ranks of the heads of vaishya households, the grhapatis, though the sources also mention younger kshatriyas going in to trading activities. There was a string of towns which ranged from the eastern Punjab settlement of Indraprastha (today's Delhi) to Kasi (widely known as the holy city of Benaras) in the eastern Gangetic Valley. This transition, as I mentioned earlier, is called the second urbanization--however, some scholars have suggested that, instead of thinking of north India going through two separate and unrelated phases, there may have been one long phase which had stronger and weaker moments. Such a theory takes the glory of founding civilization in South Asia away from the Aryans and puts it with general economic and commercial processes which go back to the founding of Harappan culture and its spread beyond the Indus Valley region. Access to greater wealth, in agriculture and trade, meant that the grhapati heads of vaishya families used only a apart of their production for ritual prestations. This gave the householders greater scope for action. During the second urbanization the grhapati, liberated from the heavy press of ritual prestation and the limitations of lineage control, emerged in the literature with more clearly defined economic functions.