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 * Ric