Humphreys, Richard Stephen,  1942 <br/><br/>
The Ayyubids of Damascus, 589-658/1193-1260 :  a principality in medieval Syria / 
Richard Stephen Humphreys 
 - Ann Arbor, Mich. :  University Microfilms International  1969 
 - v, ;  21 cm. 
<br/><br/>Thesis (Ph.D) - University of Michigan, 1969 
<br/><br/><label>Subjects--Geographic Terms: </label><br/>Syria--Politics and government