Eventually, Aristotle appeared among the Greeks. He improved the methods of logic and systematized its problems and details. He assigned to logic its… - Ibn Khaldun

(Unlike Muslims), the other religious groups did not have a universal mission, and the holy war was not a religious duty to them, save only for purposes of defence... They are merely required to establish their religion among their own people. This is why the Israelites after Moses and Joshua remained unconcerned with royal authority for about four hundred years. Their only concern was to establish their religion... The Israelites dispossessed the Canaanites of the land that God had given them as their heritage in Jerusalem and the surrounding region, as it had been explained to them through Moses. The nations of the Philistines, the Canaanites, the Armenians, the Edomites, the Ammonites, and the Moabites fought against them. During that time political leadership was entrusted to the elders among them. The Israelites remained in that condition for about four hundred years. They did not have any royal power and were harassed by attacks from foreign nations. Therefore, they asked God through Samuel, one of their prophets, that he permit them to make someone king over them. Thus, Saul became their king. He defeated the foreign nations and killed Goliath, the ruler of Philistines. After Saul, w:David became king, and then Solomon. His kingdom flourished and extended to the borders of the land of the Hijaz and further to the borders of Yemen and to the borders of the land of the Byzantines. After Solomon, the tribes split into two dynasties. One of the dysnaties was that of the ten tribes in the region of Nablus, the capital of which is Samaria(Sabastiyah), and the other that of the children of Judah and Benjamin in Jerusalem. Their royal authority had had an uninterrupted duration of a thousand years.

The sciences of only one nation, the Greeks, have come down to us, because they were translated through Al-Ma'mun's efforts. He was successful in this direction because he had many translators at his disposal and spent much money in this connection.

The only people who accept slavery are the Negroes, owing to their low degree of humanity and proximity to the animal stage. Other persons who accept the status of slave do so as a means of attaining high rank, or power, or wealth, as is the case with the Mameluke Turks in the East and with those Franks and Galicians who enter the service of the state [in Spain].