The Epistle of Jude is one of the most complex yet historically marginalized texts of the New Testament. This thesis aims to address the closely interrelated issues of authorship and dating by examining the letter's historical and contentual questions in unity. Utilizing a historical-critical approach, the study integrates literary, theological, and rigorous linguistic-exegetical analyses. Beginning with canon-historical data and the second temple Jewish apocryphal background, the scope is progressively narrowed to the exegesis of core Greek terms in pivotal passages (Jude 3–4; 17–21). The analysis demonstrates that the content of faith appears as an authoritative yet still open apostolic tradition. Through the synthesis of linguistic and theological data, the thesis attempts to provide a well-founded definition of the letter's early ecclesial context and circumstances of composition.