Undang Yang Empat
The Undang Yang Empat (Negeri Sembilan Malay: Undang Nan Ompek; Jawi: أوندڠ يڠ امڤت) are the ruling chiefs or territorial chiefs who play an important role in the election of a new Yang di-Pertuan Besar of Negeri Sembilan, Malaysia. The name is believed to be derived from the Malay word undang-undang meaning "law".
Malaysia's modern day constitution confirms the status of the Undang under Article 71, 160, 181 and the Eight Schedule of Federal Constitution as Malay Ruler within the Federation. Undangs are still chosen from amongst certain noble families in the state, the succession being both matrilineal and elective following the Adat Purbakala.