Rare volumes include a vellum copy of the Gutenberg Bible, which Grenville bought in France in 1817 for 6260 francs, a Mainz Psalter and a Shakespeare First Folio.
Thomas Jefferson | Thomas Edison | Thomas | Thomas Hardy | Thomas Mann | Thomas Aquinas | Clarence Thomas | Thomas Gainsborough | Dylan Thomas | Thomas Pynchon | St. Thomas | Saint Thomas, U.S. Virgin Islands | Thomas Carlyle | Thomas the Tank Engine | Thomas Moore | Thomas Cromwell | Thomas Becket | Thomas the Apostle | Thomas Merton | Thomas Tallis | Thomas Paine | Roy Thomas | Thomas Telford | Thomas More | Thomas Wentworth, 1st Earl of Strafford | Ryan Thomas | C. Thomas Howell | Thomas Kean | Thomas Gage | Thomas Eakins |
Notable members of the group included Lord Spencer, Lord Fitzwilliam, William Windham, and Buckingham and Grenville's older brother Thomas Grenville.
Sir Bernard Drake was an 11th-generation descendant of Edward I through his great-great-grandfather, Thomas Grenville, of Stowe, High Sheriff of Gloucestershire.