Che Puan Besar Kalsom, the Che Puan Besar and stepmother of the Sultan Tengku Fahad Mua'adzam Shah ibni Almarhum Sultan Haji Ahmad Shah Al-Musta'in Billah (born 10 February 1994) is a member of the Pahang royal family who is the Tengku Arif Temenggong.

[2] Additionally, he is the President of Pahang Rangers F.C.,[3] founder of the Sultan Ahmad Shah Environment Trust, the chairman of TAT Alliance Services,[4] and co-founder of SASET Foundation.

Media coverage of Tengku Fahad started at the proclamation of Al-Sultan Abdullah as the 6th Sultan of modern Pahang at the Abu Bakar Palace in January 2019.

[5] On 3 November 2019, he presided over the United Bentong Brilliant Network Association's Youth Carnival, which was organized by Dato' Jasvir Singh.

[7] Tengku Fahad Mua'adzam Shah, the only son and youngest child of the late Sultan Ahmad Shah Al-Musta'in Billah and his second wife, Che Puan Besar Kalsom Abdullah, was born at the Tengku Ampuan Afzan Hospital in Kuantan.