Example image of eyePlorer eyePlorer map for 'Robert de Ferrers, 6th Earl of Derby': Derbyshire Helen of Galloway Roger de Quincy, 2nd Earl of Winchester Tutbury Castle William de Ferrers, 5th Earl of Derby County of La Marche Henry III of England Hugh XI of Lusignan Westminster Abbey Edward I of England Peter II, Count of Savoy Duffield Frith Nottinghamshire Staffordshire Chartley Castle Lancashire River Mersey River Ribble Ranulf de Blondeville, 6th Earl of Chester Dower Worcester Frank-marriage Gout Richard de Clare, 6th Earl of Hertford Simon de Montfort, 6th Earl of Leicester Second Barons' War Grosmont Castle Skenfrith Castle White Castle (Wales) Louis IX of France Provisions of Oxford Gloucester Castle Henry de Montfort Margaret Ferrers, Countess of Derby Peveril Castle Robert de Ferrers, 2nd Earl of Derby John of England Robert of Gloucester (historian) Crich Northampton Castle Battle of Lewes Bolsover Castle Horston Castle Tickhill Castle De Montfort's Parliament Tower of London Kenilworth Castle Roger Mortimer of Wigmore Battle of Evesham Duffield Castle, Derbyshire