What was Al-Andalus?

The story behind the answer

After 711 CE, forces under Tariq ibn Ziyad crossed from North Africa, toppled the Visigothic kingdom, and established Al‑Andalus— Iberian territories under Islamic governance. At its height it covered most of the peninsula; later it fragmented into taifas and endured in the Nasrid Emirate of Granada until 1492. Centered at Córdoba, it fostered advances in medicine, mathematics, agriculture (new irrigation systems, citrus, and rice), and the translation of Greek learning. Think of figures like Averroes and the Great Mosque of Córdoba, or the later splendor of the Alhambra.

By contrast, Roman Hispania and Visigothic rule predate 711, while contemporary Christian realms were largely confined to the north and gradually expanded south during the centuries-long Reconquista.