1. 
   Assertor
   As·sert'or noun [ Latin , from asserere .] One who asserts or avers; one who maintains or vindicates a claim or a right; an affirmer, supporter, or vindicator; a defender; an asserter. « The assertors of liberty said not a word. M...
   Found op http://www.encyclo.co.uk/webster/A/132
   
   
2. 
   Assertor
   • (n.) One who asserts or avers; one who maintains or vindicates a claim or a right; an affirmer, supporter, or vindicator; a defender; an asserter.
   Found op http://thinkexist.com/dictionary/meaning/assertor/
   
   
3. 
   assertor
   asserter, assertor, asseverator Someone who claims to speak the truth.
   Found op http://www.wordinfo.info/words/index/info/view_unit/1942/
   
   

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