It has been narrated on the authority of Anas that the Prophet of Allah ﷺ wrote to Chosroes (King of Persia), Caesar (Emperor of Rome), Negus (King of Abyssinia) and every (other) despot inviting them to Allah, the Exalted. And this Negus was not the one for whom the Messenger of Allah ﷺ had said the funeral prayers.  

أَنَّ نَبِيَّ اللَّهِ ﷺ كَتَبَ إِلَى كِسْرَى وَإِلَى قَيْصَرَ وَإِلَى النَّجَاشِيِّ وَإِلَى كُلِّ جَبَّارٍ يَدْعُوهُمْ إِلَى اللَّهِ تَعَالَى وَلَيْسَ بِالنَّجَاشِيِّ الَّذِي صَلَّى عَلَيْهِ النَّبِيُّ ﷺ  

" And he was not the Negus for whom the Prophet ﷺ had said the funeral prayers."  

عَنِ النَّبِيِّ ﷺ بِمِثْلِهِ وَلَمْ يَقُلْ وَلَيْسَ بِالنَّجَاشِي الَّذِي صَلَّى عَلَيْهِ النَّبِيُّ ﷺ  

It has been narrated on the authority of the same narrator through another chain of transmitters with the same difference in the wording.  

عَنْ أَنَسٍ وَلَمْ يَذْكُرْ وَلَيْسَ بِالنَّجَاشِيِّ الَّذِي صَلَّى عَلَيْهِ النَّبِيُّ ﷺ