The great Jewish scholar, philosopher and doctor to the Sultan Saladin in Fez (Fostat - old Cairo), Egypt, Maimonides, is also known by his acronym, RAMBAM.  What was his great work and how was it received?

Maimonides was born in Muslim Spain (in what is sometimes known as 'the Golden Age') but when he was only 13 he and his family had to flee from the vicious Almohad Berber Muslims in 1148 of the Common Era (Christians tend to call it AD but since we don't consider Jesus as our lord, we don't date things by 'the year of our lord!). But CE dates are exactly the same as AD ones!

Maimonides most importantly wrote the Mishneh Torah commentary which he described as his 'Hibbur hagadol' or greatest compilation (magnum opus). It is a comprehensive guide to the halacha. Though it was radical in leaving out lengthy discussions and citations, and his books were burned by other Jews (the 'Maimonidean controversy' raged on for 100 years), it is now a central work for intensive yeshiva study around the world!