The early reliefs of Sanchi Stupa No.2 are older than the more extensive pillar carvings .
An Encyclopaedia of Indian Archaeology , by Amalananda Ghosh , BRILL p.295Buddhist Architecture Huu Phuoc Le Grafikol , 2010 p.161 These reliefs have been described as `` the oldest extensive stupa decoration in existence '' .
Indo-Greek Kingdom