Sultan of Johor
On 10 May 1981, Tunku Mahmud was appointed as the Regent of Johor following the death of his father, and was sworn in as Sultan a day later, shortly before his father was buried. In turn, his younger brother, Tunku Abdul Rahman (not to be confused with Tunku Abdul Rahman, Malaysia's first Prime Minister), formerly the Tunku Mahkota of Johor for twenty years under Sultan Ismail, was appointed the Tunku Bendahara of Johor, a post which he held until his death in 1989. In the same year on 12 December, Sultan Iskandar was appointed as the Chancellor of Universiti Teknologi Malaysia.
Under the elective monarchy system of Malaysia, Sultan Iskandar was elected to be the new Yang Di-Pertuan Agong on 9 February 1984 by the council of rulers—shortly before his predecessor's term expired on 26 April 1984. He succeeded the Sultan of Pahang as the Yang-Di Pertuan Agong on 26 April. A royal investiture was held shortly after that, in which he donned the traditional suit of the Agong, whereby he was officially installed. Sultan Iskandar served in the capacity as the Yang-Di Pertuan Agong until 1989, whereby the Sultan of Perak succeeded him. As the Yang di-Pertuan Agong, Sultan Iskandar was automatically designated under constitutional provisions as the Supreme Commander of the Malaysian Armed Forces, holding the rank of the Marshal of the Royal Malaysian Air Force, Admiral of the Fleet of the Royal Malaysian Navy and Field Marshal of the Army.
On 8 April 2006, the Sultan appointed his grandson Tunku Ismail Ibrahim—the son of the Tunku Mahkota—as the Raja Muda during an investure in conjunction on his birthday. The rank of Raja Muda denotes that Tunku Ismail is third in position in terms of the order of succession to the Johor royal throne.
Read more about this topic: Iskandar Of Johor