Baghdad’s House of Wisdom made “golden age” a later slogan
Scholars use Islamic Golden Age for cultural flowering from the eighth through fourteenth centuries, often from Harun al-Rashid’s Baghdad academies to the Mongol sack of 1258—sometimes stretched to Timurid or fifteenth-century scenes. The shiny metaphor itself is a nineteenth-century Orientalist coinage.
The usual starting point is the reign of the Abbasid caliph Harun al-Rashid, from 786 to 809, and the founding of the House of Wisdom in Baghdad, then among the largest cities on earth. It drew scholars from across the Muslim world to render the classical learning of other civilisations into Arabic. The activity was not confined to Baghdad: Cairo, Umayyad Córdoba, Damascus, Nishapur, Samarkand, Ghazni, Kairouan, Fez and later Nasrid Granada all became centres.
Where it ends is contested. The conventional marker is the Mongol siege of Baghdad in 1258 and the fall of the Abbasid caliphate. Some scholars stretch it to around 1350 to take in the Timurid Renaissance, others into the fifteenth century to include Granada's court, and a few into the sixteenth to cover the gunpowder empires. Going the other way, Khan in 2003 argued the true peak was 750 to 950, with territorial losses beginning under Harun, worsening after al-Ma'mun died in 833 and compounded by the crusades.
The label itself is modern and loaded. It came from nineteenth-century Orientalist writing; an 1868 travel handbook for Syria and Palestine praised Damascus mosques as relics of Islam's golden age while calling the religion itself in rapid decay. Early users disagreed wildly on its span, from six and a half centuries of caliphate to just the few decades of Rashidun conquest before the death of Umar. In the early twentieth century it still usually meant those military victories, and only after about 1950 did it become common, now pointing mainly to science and mathematics in the ninth to eleventh centuries.
Mohamad Abdalla notes that most scholars frame the story as rise and decline: a translation drive for Greek science in the eighth and ninth centuries, two centuries of original work from the late ninth to the late eleventh, then an age of decline. That decline narrative, he observes, has become the default in academic writing since the nineteenth century.
Source: Islamic Golden Age