Historian J.G. de Casparis in his dissertation for a doctorate at 1950 argues that Borobudur is a place of worship. Based on the inscriptions Karangtengah and Kahulunan, Casparis estimate the founder of Borobudur is the king of Mataram dynasty named Samaratungga, who do construction around the year 824 AD The giant new building could be completed at the time of her daughter,Queen Pramudawardhani. Borobudur Construction estimated totake 50 years
