Richard Patrick Crosland Hanson (1916–1988) was bishop of Clogher in the Church of Ireland from 1970 to 1973. A historian of antiquity (he claimed to distrust history written concerning periods subsequent to 600 AD) he was particularly noted for a life of St. Patrick. He discovered that ecumenical work was particularly restricted in the context of the Troubles in a diocese lying on both sides of the border between Northern Ireland and the Republic of Ireland, which he accordingly resigned to take up a professorship in Systematic Theology in the Faculty of Theology at Manchester University. During this period he worked notably on the evolution of Christian theology in the period between (and immediately prior to) the Councils of Nicea (325 AD) and Constantinople (381 A. D.) He was the first British or Irish contributor to the Sources Chrétiennes collection of early Christian writings. Among his writings was Reasonable Belief which was written jointly with his brother. In the introduction he notes "One of the authors is an Anglican priest and the other an Anglican bishop, and neither can jump out of his skin" (p. x) and "It should perhaps be explained that this book is not only a collaboration between two Anglican theologians but between two identical twin brothers" (p. xi).