Formalizing Legislation in the Event Calculus: The Case of the Italian Citizenship Law Marcello Di Bello Abstract: This thesis explores to what extent legal knowledge and legal reasoning can be encoded in the Event Calculus (hereafter, EC), and how EC needs to be extended (if at all) to accommodate legal reasoning and knowledge. The locutions 'legal knowledge' and 'legal reasoning' gather a variety of disparate referents. A working hypothesis of this thesis is that a considerable portion of legal knowledge and reasoning is contained in legislative texts (laws, decrees, regulations, directives, etc.). The primary task will thus be to formalize a piece of legislation in the language of EC.