Worawongsathirat (Thai: วรวงศาธิราช) was a usurper in the Ayutthaya Kingdom, ruling for only 42 days in 1548 before being assassinated. Siamese chronicles relate that Worawongsathirat attainted the crown — his kingship is not accepted by most traditional historians. Si Suda Chan was not a real name of a person, it was the title of one of the four first-class concubines, which were Insuren, Si Suda Chan, Inthrathewi and Si Chula Lak. The real name of King Chairachathirat's consort was not mentioned in the history.