The story follows the course of the life of Suriyothai from her adolescence to her death. As Suriyothai is only known from three lines in a chronicle, most of the film relies on an invented story rather than claiming to be actual history. It presents a young woman, Suriyothai, of minor royal standing who has strong opinions and self-determination. The movie reveals the princess' boldness through scenes where she breaks tradition by walking among the commoners to meet her lover Prince Pirenthorathep, who in turn pledges that he will come to her aid whenever she wants.