Academic history is different than the real history.
We are lucky that we got resources to know different versions of history. Consider those people living in Pakistan during 70s - 90s, who could only keep their hands on one-sided history in the shape of Government approved syllabus books and material from the writers like Naseem Hijazi and Ilyas Sita Puri chanting slogans of Nishat e Sania of Muslim Umma and hiding what the rulers of Muslim umma were upto.