He was famous as a scholar, restorer of ancient buildings (including Cardiff Castle, Castell Coch, Rothesay Castle, Falkland Castle, Old Place Mochrum, Chrichton Peel Sanquhar, St. Andrews Priory and Pluscarden Priory), liturgical historian, linguist, traveler and philanthropist. He was mayor of Cardiff and provost of Rothesay, lord lieutenant of Bute, president of the University of Wales Cardiff, rector of St. Andrews University and benefactor of St. Andrews and Glasgow universities, among others. He was a convert to Catholicism, and was the model for the central character in Disraeli's novel Lothair.