The proposed project aims to determine the origins and diachronic development of “genitive of negation” (GenNeg) in Germanic, and to evaluate its relationship with GenNeg as found in Balto-Slavic and Balto-Finnic languages from a historical, and typological viewpoint. GenNeg is a morphosyntactic phenomenon whereby the argument (subject/direct object) of a verb is assigned the genitive/partitive case under negation. This phenomenon is particularly widespread in the Balto-Slavic group and in Balto-Finnic languages. Several historical Germanic languages present cases of GenNeg as well. These cases, however, have received little to no attention in linguistic research to date. Nevertheless, in Bucci (2020) I have shown that GenNeg was indeed an available feature in Gothic, and that it shows striking similarities to those languages where GenNeg is also a restricted feature. With these earlier results as its starting point, the current project aims to go further in reconstructing how GenNeg became a grammatical rule in Germanic. Furthermore, the project will investigate the typological affiliations of early Germanic GenNeg. To do this, I will collect the missing data from ancient Germanic languages and compare them to the other known examples of GenNeg from a European perspective. This project will also answer theoretical questions regarding the encoding of GenNeg at the intersection of Construction Grammar and Generative Grammar.