The Yang di-Pertuan Besar of Negeri Sembilan’s Birthday is observed in Negeri Sembilan, Malaysia, every January 14. This day marks the birthday of the Yang di-Pertuan Besar, the state's monarch, who holds a significant ceremonial role. The title, which translates to "He Who Is Made Great," was first conferred in 1773 when Raja Melewar of the Minangkabau people established the ruling dynasty with permission from the Sultan of Johor. Since Tuanku Muhriz ibni Almarhum Tuanku Munawir's accession, this date has been officially celebrated. The birthday serves as a public holiday in the state, reflecting the importance of the monarchy in Malaysian culture, where rulers have representative functions and act as spiritual leaders. The Yang di-Pertuan Besar also participates in the election of the Yang di-Pertuan Agong, the ruler of Malaysia, every five years.