Via Wikipedia (with boldtype and html links in the original): “The Round City of Baghdad is the original core of Baghdad, built by the Abbasid Caliph al-Mansur in 762–766 CE as the official residence of the Abbasid court. Its official name in Abbasid times was The City of Peace (Arabic: مدينة السلام ; romanized: Madīnat as-Salām). The famous library known as the House of Wisdom was located within its grounds.” More details about this splendid lost city are available here.
