In 1561, a Eucharistic controversy erupted in Danzig of the sixteenth century, sparked by disagreements on the real presence and the practical treatment of the Eucharistic elements. It was one of many inner-Lutheran struggles over the Lord's Supper in the years following the Reformation and therefore Bjorn Ole Hovda supplements the scientific studies on that topic. Different understandings of the presence of Christ during the Lord's Supper formed different religious norms of practice. On the one hand, the controversy is here analysed as a discussion on doctrine between opposing ecclesiastical factions, set in the context of reformatory theology and liturgical practice. The theological discussions had important practical and cultic implications. One the other hand -- and in contrast with the most of earlier works - the study seeks to treat with equal seriousness the wider societal and political aspects of the controversy. Hovda shows how deeply embedded the Eucharist was within broader discourses of culture, society and politics. Far from being just an abstruse ecclesiastical matter, it was a question of great sociopolitical interest and potency. The Eucharist served both as the prime symbol of Christian unity, as well as a confessional border stone between rivaling groups. Other important aspects of this wider analysis are tensions between the ordained ministry and the city council regarding authority, internal social tensions within the city, as well as the strategic interests of the city in its relations to the Polish crown, the Hanseatic league and the emerging new trading powers, among others.Through a close study of one particular controversy, light is cast on a variety of issues with relevance to the broader field of Reformation studies, especially concerning the centrality of the Eucharist.