Another staple of the Thai film industry, among the biggest was 2003's "The Legend of Suriyothai" by Chatrichalerm Yukol, who had done research for many years to write the screenplay. With a huge budget, support from the royal family and the cooperation across the nation's film industry, this film is considered a true "national film". A follow-up epic is 2007's "King Naresuan", about 16th century ruler King Naresuan the Great, which topped the budget for "Suriyothai", and was shown in two parts.