The Yarnall Library of Theology, a major American rare book collection, is part of Penn's libraries. The Yarnall Library of Theology was formerly affiliated with St. Clement's Church in Philadelphia. It was founded in 1911 under the terms of the wills of Ellis Hornor Yarnall (December 23, 1839 - December 18, 1907) and Emily Yarnall, and subsequently housed at the former Philadelphia Divinity School. The library's major areas of focus are theology, patristics, and the liturgy, history and theology of the Anglican Communion and the Episcopal Church in the United States of America. It includes a large number of rare books, incunabula, and illuminated manuscripts, and new material continues to be added.