Between 1423 and 1425 he married Eupheme Graham (before 1413–1468), daughter of Patrick Graham, de jure uxoris Earl of Strathearn, and Euphemia Stewart, Countess of Strathearn.
Any of the wives of the holders of the title Earl of Strathearn, currently Catherine, Duchess of Cambridge (born 1982), wife of Prince William, Duke of Cambridge
James Earl Jones | Prince Edward, Earl of Wessex | Louis Mountbatten, 1st Earl Mountbatten of Burma | Herbert Kitchener, 1st Earl Kitchener | Earl | Frederick Roberts, 1st Earl Roberts | Earl of Derby | Earl Warren | Earl of Pembroke | Robert Harley, 1st Earl of Oxford and Earl Mortimer | Prince Arthur, Duke of Connaught and Strathearn | Earl of Warwick | Thomas Wentworth, 1st Earl of Strafford | Edward Smith-Stanley, 14th Earl of Derby | Earl of Shrewsbury | William Pitt, 1st Earl of Chatham | Simon de Montfort, 6th Earl of Leicester | Richard Neville, 16th Earl of Warwick | Earl of Leicester | John Scott, 1st Earl of Eldon | Robert Devereux, 2nd Earl of Essex | Robert, 1st Earl of Gloucester | Edward Harley, 2nd Earl of Oxford and Earl Mortimer | Earl of Devon | Douglas Haig, 1st Earl Haig | My Name Is Earl | Edward Hyde, 1st Earl of Clarendon | Earl Scruggs | Earl of March | Richard Howe, 1st Earl Howe |
He petitioned Queen Victoria to use the title in Great Britain, and after an objection by Lord Strathearn, was allowed the title 'Baron Campbell von Laurentz'.
--William is no longer "of Wales"--> was created Duke of Cambridge, Earl of Strathearn and Baron Carrickfergus.