Sayyidina Imram ibn Husayn narrated that Allah’s Messenger (SAW) said to them, “Your brother, the Najashi (Negus) has died. So stand up and pray over him.” They stood up and arranged themselves in rows as are arranged for the dead, and they prayed over him (the funeral salah) as is prayed over the dead.
[Ahmed19912, Muslim 953, Nisai 1942]