Tunku Naquiyuddin ibni Almarhum Tuanku Ja'afar is the eldest son of Tuanku Jaafar ibni Almarhum Tuanku Abdul Rahman, the Yang di-Pertuan Besar of Negeri Sembilan, who was also a former Yang di-Pertuan Agong (King) of Malaysia.
Tunku Naquiyuddin served as regent of Negeri Sembilan from 1994-1999 when his father was elected as the King of Malaysia.Suave, charming and debonair, Tunku Naquiyuddin had been for years one of Malaysia's most well-known member of royalty, and was widely expected to succeed his father as the Yang di-Pertuan Besar of Negeri Sembilan.
However he was bypassed as Ruler in favour of his cousin, Tunku Muhriz, upon the death of his father.