The book Muajam Al-Buldan of Yaqut Al-Hawi (D: 626 AH / 1228 AD ) is one of the most important scientific encyclopedias that draw in the seventh century AH / thirteenth century , as this encyclopedia included shores different colors of geographic information , literary and historical , making it a reference for many researchers in the Islamic tradition , where arranged Sapphire book Lexicon countries on the letters of the alphabet careful arrangement coordinator . Vcildath multi accommodate many of the economic and social studies because of the crowd amount of information dealt with , where he received the sapphire on this information through his travels and his observations personal and was an eyewitness to many of the events of the region, including the Mongol invasion , and leave us Sapphire great wealth of literature amounted to dozens of books . Department research into two sections and a conclusion , taking the first research the life of Ruby and his time and his travels and writings , and taking the second part, Sapphire Yaqut Al-Hamwi and his resources of biplography books and general history In, and the finale was a presentation of the most important findings of the research