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Updated: May 24, 2025
The treatise of Albategnius on "The Science of the Stars" is spoken of by Laplace with respect; he also draws attention to an important fragment of Ibn-Junis, the astronomer of Hakem, the Khalif of Egypt, A.D. 1000, as containing a long series of observations from the time of Almansor, of eclipses, equinoxes, solstices, conjunctions of planets, occultations of stars observations which have cast much light on the great variations of the system of the world.
He slew in battle a lieutenant of the Abbassides, who had invaded his dominions with a fleet and army: the head of Ala, in salt and camphire, was suspended by a daring messenger before the palace of Mecca; and the caliph Almansor rejoiced in his safety, that he was removed by seas and lands from such a formidable adversary.
The same Casiri says, with regard to Fez, that it was founded by Edno Ben Abdallah, under the reign of Almansor Abu Giafar; he is quite satisfied with that assertion, but does not perceive that it contains a glaring anachronism.
The cultivators of mathematics, astronomy, medicine, and general literature abounded in the court of Almansor, who invited all philosophers, offering them his protection, whatever their religious opinions might be. His successor, Alraschid, is said never to have travelled without a retinue of a hundred learned men.
When they were built the land was still liable to incursions, and raids from the south, such as the famous foray of Almansor, who harried and burned the whole land not sparing even the shrine of Santiago far north in Galicia. Their builders were still little more than a race of hardy soldiers with no great skill in the working of stone.
In this city of peace, amidst the riches of the East, the Abbassides soon disdained the abstinence and frugality of the first caliphs, and aspired to emulate the magnificence of the Persian kings. After his wars and buildings, Almansor left behind him in gold and silver about thirty millions sterling: and this treasure was exhausted in a few years by the vices or virtues of his children.
Almansor, the second of the dynasty of the Abbassides, whose reign commenced A.D. 754, and lasted twenty-one years, was among the first of the Arab princes to foster learning and the arts.
The other foundation of Mumadona, the monastery of Nossa Senhora and São Salvador in the town of Guimarães, had since her day twice suffered destruction at the hands of the Moors, once in 967 when the castle was taken by Al-Coraxi, emir of Seville, and thirty years later when Almansor in 998 swept northwards towards Galicia, sacking and burning as he went.
He was in high favor with the King of Morocco and of Spain, El-Mansur Jacub, often known as Almansor, who made him one of his counsellors. His works are much more important for philosophy than for medicine, and his philosophical writings gave him a place only second to that of Aristotle in the Western world during the Middle Ages.
After their civil and domestic wars, the subjects of the Abbassides, awakening from this mental lethargy, found leisure and felt curiosity for the acquisition of profane science. This spirit was first encouraged by the caliph Almansor, who, besides his knowledge of the Mahometan law, had applied himself with success to the study of astronomy.
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