This is a list of people who have served as Custos Rotulorum of the East Riding of Yorkshire. Sir William Babthorpe bef. 1544–1555 Christopher Estoft bef. 1558–1566 John Vaughan bef. 1573–1577 Ralph Rokeby 1577 – aft. 1584 Thomas Knyvet, 1st Baron Knyvet bef. 1594 – aft. 1608 Sir William Constable, 1st Baronet bef. 1621–1626 Sir William Alford 1626 – aft. 1636 Sir William Strickland, 1st Baronet 1642–1646 Interregnum Sir John Hotham, 2nd Baronet 1660–1680 John Sheffield, 3rd Earl of Mulgrave 1680–1682 Charles Seymour, 6th Duke of Somerset 1682–1687 John Sheffield, 3rd Earl of Mulgrave 1687–1689 Thomas Osborne, 1st Duke of Leeds 1689–1699 John Holles, 1st Duke of Newcastle 1699–1711 Peregrine Osborne, 2nd Duke of Leeds 1711–1715 Rich Ingram, 5th Viscount of Irvine 1715 Richard Boyle, 3rd Earl of Burlington 1715–1721 William Pulteney 1721–1728 For later custodes rotulorum, see Lord Lieutenant of the East Riding of Yorkshire. References Institute of Historical Research - Custodes Rotulorum 1544-1646 Institute of Historical Research - Custodes Rotulorum 1660-1828 Yorkshire