The Rev Dr Peter Clarkson Matheson (1938–2025) was a respected theologian, historian, poet, and peace activist whose life was shaped by a deep commitment to justice, reconciliation, and faith. From leading anti-nuclear protests and advocating for environmental action to pioneering scholarship on the Reformation and fostering communities of hospitality and inclusion, Peter combined intellectual rigour with compassionate activism. This tribute reflects on his remarkable journey across academia, church leadership, and public life, and the enduring legacy of a man who believed in the power of words, hope, and faith to transform the world.