Under Chandragupta and his successors, internal and external trade, agriculture and commercial activities all thrived and expanded across the Indian subcontinent due to the establishment of a cohesive system of finance, administration, and security. The empire was divided into four provinces, the imperial capital being at Pataliputra. From Asokan edicts, the names of the four provincial capitals were Tosali (in the eastern Ganges plain), Ujjain (in the western Ganges plain), Suvarnagiri (in the Deccan), and Taxila (in the northern Indus Valley). The head of the provincial administration was the "Kumara" (royal prince), who governed the provinces as king's representative and was assisted by "Mahamatyas" and a council of ministers. The empire also enjoyed an era of social harmony, religious transformation, and expansion of the sciences and of knowledge.