وَإِذَا قَرَأْتَ الْقُرْآنَ جَعَلْنَا بَيْنَكَ وَبَيْنَ الَّذِينَ لَا يُؤْمِنُونَ بِالْآخِرَةِ حِجَابًا مَّسْتُورًا 
Volume I gives a summary of the Crusades which preceded the establishment of the Ayubid state and discusses the historical roots of the Crusader movement, such as the Byzantine-Islamic conflict at the beginning of the Islamic state, Islamic Spain in Andalusia