Che Puan Besar Kalsom, the Che Puan Besar and stepmother of the Sultan Brigadier General Tengku Amir Nasser Ibrahim Shah ibni Al-Sultan Abdullah Ri’ayatuddin Al-Mustafa Billah Shah (born Tengku Amir Nasser Ibrahim Shah bin Tengku Ibrahim; 25 August 1986) is a member of Pahang royal family who is the Tengku Panglima Raja.

Tengku Amir is also his father's youngest son from his third wife, Puan Sri Czarina binti Abdullah who is of Filipino descent.

[1] Tengku Amir Nasser Ibrahim Shah married Yang Hormat Mulia Che Puan Panglima Raja Puteri Hajah Suraiya Afzan binti Dato' Indera Haji Mohamed Moiz on 19 December 2013.

On 15 August 2019, upon the accession of his adoptive father as Sultan of Pahang, Tengku Amir Nasser Ibrahim Shah was conferred the title Tengku Panglima Raja.

[2] In his capacity as Tengku Panglima Raja, Tengku Amir Nasser Ibrahim Shah also serves as Deputy President of the State Islamic Religious and Malay Customs Council (MUIP).