:I'm failing at this stage, as the article needs considerable work, as listed below.    

 Well-written: 

 (a) the prose is clear and concise, respects copyright laws, and the spelling and grammar are correct;  
 * The prose needs some work. 

 (b) it complies with the manual of style guidelines for lead sections, layout, words to watch, fiction, and list incorporation. 
 * The list of dates should really become regular prose. The Lead needs considerable work, as it doesn't really summarise the article. 

 Factually accurate and verifiable: 

 (a) it provides references to all sources of information in the section(s) dedicated to the attribution of these sources according to the guide to layout; 
 * Multiple forms of referencing are in use.  

 (b) it provides in-line citations from reliable sources for direct quotations, statistics, published opinion, counter-intuitive or controversial statements that are challenged or likely to be challenged, and contentious material relating to living persons—science-based articles should follow the scientific citation guidelines; 

 * Large parts are unreferenced, including challengable material in Origins, Military tactics, Assassination, Downfall and aftermath, and In popular culture. 
 * Some citations, e.g. that for the Timeline section, don't marry up at all with the text in the article.  

 (c) it contains no original research. 
 * Hard to tell, as much is unreferenced. 

 Broad in its coverage: 

 (a) it addresses the main aspects of the topic; 
 * Yes. 

 (b) it stays focused on the topic without going into unnecessary detail (see summary style). 
 * Yes. 

 Neutral: it represents viewpoints fairly and without bias, giving due weight to each. 
 * Probably neutral. 

 Stable: it does not change significantly from day to day because of an ongoing edit war or content dispute. 
 * Stable.  

 Illustrated, if possible, by images: 

 (a) images are tagged with their copyright status, and valid fair use rationales are provided for non-free content;  
 * File:Asabah2.jpg, File:Crusaderstates.jpeg both need work. 

 (b) images are relevant to the topic, and have suitable captions. 
 * Several captions end in a period (.) but are not complete sentenced.