This paper seeks to investigate how the mutual guarantee clauses of the treaties of Westphalia, which ended the Thirty Years War in 1648, affected European diplomacy until the late eighteenth century. It will first analyse the reception and impact of the guarantee of the Peace of Westphalia in the European Law of Nations and in subsequent treaty law. Secondly, it will assess the practical impact of this feature of the Law of Nations on European diplomacy, and how this influence changed over time. This will also include an analysis of how diplomacy and shifting power-political currents altered the content of the guarantee in the Law of Nations. In analysing the guarantee’s influence on diplomacy, the paper places a particular emphasis on Franco-Imperial and Swedish-Imperial relations, as well as the perception of the guarantee among diplomats and other political actors during political, constitutional and confessional conflicts within the Holy Roman Empire.

本文旨在调查威斯特伐利亚条约（1648年结束三十年战争）的相互保证条款如何影响欧洲外交直至18世纪末。它将首先分析《欧洲国家法》和随后的条约法对《威斯特伐利亚和约》保障的接受和影响。其次，它将评估《国际法》这一特征对欧洲外交的实际影响，以及这种影响如何随时间变化。这还将包括对外交和权力政治潮流的变化如何改变《国际法》中担保内容的分析。在分析担保对外交的影响时，本文特别强调法英两国关系和瑞典与帝国关系，