Anabel Thomas <br/><br/>
Garrisoning the Borderlands of Medieval Siena  Sant'Angelo in Colle: Frontier Castle under the Government of the Nine (1287–1355) 

 -  Taylor and Francis  2011 
<br/><br/><label>ISBN: </label>9781315254739 
<br/><br/><label>Source: </label>EBOOK