Abbasid rule began in 750 and ended when sacked by Mongols in 1258. Abbasids moved the Capital from Damascus to Baghdad and it grew to a population of about 2 million under their rule. Most of the caliphs were enlightened, valued scholarship and spend heavily on the institutions of learning and education. It is estimated that their expenditure on education in relation to their revenue was much higher than the governments of the most advanced countries spend on education today. This was a major factor that led to the golden age(8th to 13th century). Below is a link to a discussion on Abbasid Caliphate on a BBC rodio 4 on program called "In Our Times". https://www.youtube.com/watch? v=CoAzjRSqBN0&t=589s
This site contains basic information on Islam and Sufism. My goal is to post material that would assist readers to gain some understanding of Islam and Sufism. The posts may include history, Islamic art, architecture, cultural and physical landscape and any other related material that has some educational merits. At this time the material is not organized and one has to scroll down to see the contents.