Analysis of information sources in references of the Wikipedia article "Kekhalifahan Fathimiyah" in Indonesian language version.
... it was at this time that an indigenous Arabic culture was developed in Egypt, and Arab Egypt, so to speak, came of age to the extent that it was able to rival older centres like Baghdad as a seat of learning and intellectual activity.
In the course of the later eleventh and twelfth century, however, the Fatimid caliphate declined rapidly, and in 1171 the caliphate was dissolved and the Fatimid dynasty was overthrown by Ṣalāḥ ad-Dīn, the founder of the Ayyubid dynasty. He restored Egypt as a political power, reincorporated it in the Abbasid caliphate and established Ayyubid suzerainty not only over Egypt and Syria but, as mentioned above, temporarily over northern Mesopotamia as well.
... it was at this time that an indigenous Arabic culture was developed in Egypt, and Arab Egypt, so to speak, came of age to the extent that it was able to rival older centres like Baghdad as a seat of learning and intellectual activity.
In the course of the later eleventh and twelfth century, however, the Fatimid caliphate declined rapidly, and in 1171 the caliphate was dissolved and the Fatimid dynasty was overthrown by Ṣalāḥ ad-Dīn, the founder of the Ayyubid dynasty. He restored Egypt as a political power, reincorporated it in the Abbasid caliphate and established Ayyubid suzerainty not only over Egypt and Syria but, as mentioned above, temporarily over northern Mesopotamia as well.