Sir Alexander Mortimer, The 7th Duke of Dorchester

Sir Alexander Mortimer, The 7th Duke of Dorchester and during his lifetime the head of House Mortimer. Alexander was the eldest son of Lord Roger Mortimer, the second son of the 5th Duke of Dorchester. Alexander married the Lady Anne Beaumont, the eldest daughter of Prince Richard of Wessex, The 1st Duke of Chelsea and his wife Elizabeth, The Dowager Duchess of Chelsea. Together the couple had two children:
 * 1) Sir Alexander Mortimer, The 8th Duke of Dorchester: who married Alice Scott, the heiress of the Scott Family. Together the couple has four children: three daughters The Lady Cassandra Beaumont The Duchess of Chelsea; The Lady Arabella Somerset, The Duchess of Beverly; The Lady Maria Lascelles, The Countess of Medford. The couple also had one son: Sir Roger Mortimer, The 9th Duke of Dorchester.
 * 2) The Lady Catherine Marshal, The Countess of Derby: who married Sir Alan Marshal, The 3rd Earl of Derby and Lord Chamberlain of King Henry III's Household.