historians??? he was still a KING.... he was a KING after his father and was succeeded as a king..his family persecuted the ahle bayt... hardly something 2 be proud of!
hadith of the 12 amirs:

Sahih Bukhari:

Narrated Jabir bin Samura: I heard Muhammad saying, "There will be twelve Muslim rulers." He then said a sentence which I did not hear. My father said, "All of them (those rulers) will be from Quraish."

Sahih Muslim :

Narrated Jabir bin Samura: I heard Muhammad saying, "The (Islamic) religion will continue until the Hour (day of resurrection), having twelve Caliphs for you, all of them will be from Quraysh."

Sunan Abu Dawood :

The Prophet said: "This religion remains standing until there are twelve vicegerents over you, all of them agreeable to the nation, all of them from Quraysh."

Sunan al-Tirmidhi :

The Prophet said: "There will be after me twelve Amir (Prince/Ruler), all of them from Quraysh."