opera based on The Pilgrim's Progress by Ralph Vaughan Williams, which Williams referred to as a 'Morality', was first performed at the Royal Opera House in 1951 as part of the Festival of Britain and revived in 2012 by the English National Opera. John Bunyan had six children, five of whom are known to have married, of whom four had children. Moot Hall Museum (in Elstow) has a record of Bunyan's descendants, down to the nineteenth century, but , no verifiable trace of later descendants has been found. Selected bibliography The best collection of Bunyan's writing is The Works of John Bunyan, edited by George Offor and published in London in three volumes between 1853 and 1855, containing 61 unique works. (A revised edition was published in 1862.) The misnamed Complete Works of John Bunyan, edited by John Gulliver and published in one volume by Bradley, Garretson & Co. in 1871, omits 28 works and lacks the biblical references and editorial footnotes present in Offor's collection. Among Bunyan's many works: A Few Sighs from Hell, or the Groans of a Damned Soul, 1658 A Discourse Upon the Pharisee and the Publican, 1685 A Holy Life Christ a Complete Saviour (The Intercession of Christ And Who Are Privileged in It), 1692 Come and Welcome to Jesus Christ, 1678 Grace Abounding to the Chief of Sinners, 1666 Light for Them that Sit in Darkness Praying with the Spirit and with Understanding too, 1663 Of Antichrist and His Ruin, 1692 Reprobation Asserted, 1674 Saved by Grace, 1675 Seasonal Counsel or Suffering Saints in the Furnace – Advice to Persecuted Christians in Their Trials & Tribulations, 1684 Solomon's Temple Spiritualized Some Gospel Truths Opened, 1656 The Acceptable Sacrifice The Desire of the Righteous Granted The Doctrine of the Law and Grace Unfolded, 1659 The Doom and Downfall of the Fruitless Professor (Or The Barren Fig Tree), 1682 The End of the World, The Resurrection of the Dead and Eternal Judgment, 1665 The Fear of God – What it is, and what is it is not, 1679 The Greatness of the Soul and Unspeakableness of its Loss Thereof, 1683 The Heavenly Footman, 1698 The Holy City or the New Jerusalem, 1665 The Holy War – The Losing and Taking Again of the Town of Man-soul (The Holy War Made by Shaddai upon Diabolus, for the Regaining of the World), 1682 The Life and Death of