To mark the beginning of its centenary celebrations, the Catholic Historical Society of Ireland is happy to invite members and the public to a public lecture in Belvedere College, Dublin on Friday 9 September 2011. The lecture is entitled 'Interpreting Vatican II: the problem and its solution' and the speaker is Professor John W. O'Malley of Georgetown University, Washington DC. Professor O'Malley enjoys an international reputation as a scholar of religious history between the Council of Trent and Vatican II. His published work on the Jesuits is well known and he has contributed to the history of the councils of the Church. A meeting of the Society will be held immediately before the lecture and all members are asked to attend.