This thesis examines the unitarian liturgical treasures displayed in the exhibition opened in 2018 at the House of Religious Freedom in Cluj-Napoca, with a particular focus on their historical background. The research analyzes sixty-five communion vessels originating from twenty-nine Unitarian congregations and is based primarily on episcopal and deanery visitation records, as well as other manuscript church sources. These documents make it possible to identify the earliest references to the objects, trace their acquisition by individual congregations, and reconstruct the circumstances under which they entered ecclesiastical use. Since the history of these vessels is intertwined with that of the communities that used them, their study also provides insight into the historical development of the congregations themselves. The thesis aims to offer comprehensive examination of the history and provenance of unitarian liturgical treasures, thereby addressing a gap in unitarian church historiography and contributing to the documentation, interpretation, and preservation of this important material heritage.