The article discusses the Jodenreglement (Jewish regulations) of Hugo Grotius (1615) and the circumstances under which this treatise was written. After a brief overview of the development of the concept of “tolerance”, a short survey of the Jewish presence in the Netherlands is given. The article then discusses the reasons for drafting the treatise, the life of Hugo Grotius and the text itself which resulted in the de facto tolerance of Jews in Amsterdam. ; The article discusses the Jodenreglement (Jewish regulations) of Hugo Grotius (1615) and the circumstances under which this treatise was written. After a brief overview of the development of the concept of “tolerance”, a short survey of the Jewish presence in the Netherlands is given. The article then discusses the reasons for drafting the treatise, the life of Hugo Grotius and the text itself which resulted in the de facto tolerance of Jews in Amsterdam.