The discovery was made in February 1877 during restoration of the Cathedral nave. A number of circular mural oil paintings were revealed in line under the five lower windows of the south nave aisle. Many of the circular paintings were of heraldic arms in the usual shield form. The paintings are believed to have been executed in the closing years of the 16th century and the beginning of the Civil War. A majority of the arms are believed to be those of civic office bearers who are buried in the Cathedral. Google with the Archive Organization has sponsored the digitisation of books from several libraries. The Internet Archive makes available, in its Community Texts Collection (originally known as Open Source Books), books that have been digitised by Google from a number of libraries. These are books on which copyright has expired, and are available free for educational and research use. This rare book was produced from a copy held by the University of Michigan Library, and is available from the Internet Archive.