I can connect the Sackvilles with the Earls of Dorset, as I am their direct descendant (I am the current Lord Buckhurst). The Sackvilles were originally a French family who came over to England with King William the first (the Conqueror). They settled in Sussex at Buckhurst, where we still live today, and in the 1560's Thomas Sackville, a famous poet, advisor and cousin of Queen Elizabeth, was created Lord Buckhurst. Such was her fondness for him that she futher elevated him to the Earl of Dorset and granted him a huge house called Knole. This is still owned by the family and my cousin, Lord Sackville lives there now. Thomas's great grandson was made the Duke of Dorset in the early 1700's by King George the First. The Dukedom, however became extinct, about four generations later (1830's) when the last Duke died without a male heir. So his sister Lady Elizabeth Sackville married the Earl De La Warr (a descendant of the founder of the US state of Delaware). Thus the De la Warr and Sackville family became as one,and although we were allowed to keep the Lord Buckhurst title (as that was the original one granted upon us) sadly the Dukedom of Dorset became extinct. Now the head of the Sackville family is called the Earl De La Warr (my father) and the eldest son (me) is called Lord Buckhurst. Indeed, Sackville is the family name of the now extinct Earls and Dukes of Dorset so that is how they are related. I hope this isn't too complicated!