Runciman, Steven. The Eastern Schism: A Study of the Papacy and the Eastern Churches during the XIth and XIIth Centuries. Oxford: Clarendon Press, 1956.
First published in 1955, this is the 1956 printing. Very good blue cloth with bright gilt spine titles, 5 3/4 x 8 3/4 inches, 189 clean and unmarked pp., tight. Very good intact dust jacket. The end papers have a narrow dark strip near the centers, perhaps from old paper packaging long gone. Very good in very good dust-jacket. Hardcover. 
"This book, based on seven Waynflete Lectures delivered at Magdalen College, Oxford, in the spring of 1954, is an attempt to tell the story of the final breach between the Church of Rome and the Eastern Orthodox Churches in its proper historical perspective." - dj.