Yang di-Pertuan Negara of Singapore
The Yang di-Pertuan Negara of Singapore was a title for the head of State of Singapore from 1959 to 1965. Following the state's independence from Malaysia on 9 August 1965 to became the Republic of Singapore, the title was changed to President of Singapore.
Source: Wikipedia — Yang di-Pertuan Negara of Singapore (CC BY-SA 4.0)