This study offers a comprehensive analysis of
utilitas
, a central concept in Roman law, and its pivotal role in shaping legal interpretation. Moving beyond its traditional view as a merely pragmatic tool,
utilitas
is shown to guide legal outcomes that not only address practical needs but also align with broader ethical values of righteousness and justice. It argues that a complete understanding of
utilitas
in legal reasoning - both in meaning and function - can only be achieved by synthesizing jurisprudential, philosophical, and rhetorical perspectives. Through this interdisciplinary lens the book demonstrates that decisions made
utilitatis causa
, exceptional in their departure from established legal rules, can only be fully understood through the lens of rhetorical theory of legal interpretation, offering a framework that transcends the limitations of literal interpretation. Contributing to ongoing scholarly discourse in Roman law, legal theory, and philosophy, this study provides fresh insights into a concept that remains central to contemporary discussions of legal interpretation and justice.