Al-Sultan Al-Mu’tassimu Billahi Muhibbuddin Tuanku Al-Haj Abdul Halim Mu'adzam Shah ibni Almarhum Sultan Badlishah (Jawi: ; 28 November 1927 – 11 September 2017) was the 28th Sultan of Kedah, reigning from 1958 to 2017. He served as the fifth Yang di-Pertuan Agong of Malaysia from 1970 to 1975, and as the 14th Yang di-Pertuan Agong from 2011 to 2016. He was the first and only ruler to reign as Yang di-Pertuan Agong twice, as well as the oldest elected to the office. Immediately prior to his death, he was the second longest-reigning living monarch in the world after Queen Elizabeth II of the United Kingdom.
