The title of Marquess of Halifax was created in the Peerage of England in 1682 for Sir George Savile, 4th Baronet. He had previously been created Viscount Halifax, Baron Savile of Eland (both 1668) and Earl of Halifax (1679), all also in the Peerage of England. All the titles became extinct on the death of the 2nd Marquess in 1700.

Marquesses of Halifax (1682)

• George Savile, 1st Marquess of Halifax (1633-1695)
• William Savile, 2nd Marquess of Halifax (1665-1700)

The first Marquess's sister married the 1st Earl of Plymouth . His daughter by his first wife (daughter of the 1st Earl of Sunderland ) married the 3rd Earl of Carbery . His daughter by his second wife (sister of the 1st Duke of Kingston) married the 3rd Earl of Chesterfield .

The 2nd Marquess was son of the first by his first marriage. He married Mary Finch, a daughter of Daniel Finch, 2nd Earl of Nottingham and Lady Essex Rich.

Essex was daughter of Robert Rich, 3rd Earl of Warwick and Anne Cheeke. Anne was daughter of Sir Thomas Cheeke of Pirgo and a senior Essex Rich.

The elder Essex was daughter of Robert Rich, 1st Earl of Warwick and Penelope Devereux, Lady Rich. Essex was probably named after her maternal grandfather Walter Devereux, 1st Earl of Essex. Her maternal grandmother was Lettice Knollys.

William Savile was father-in-law to Richard Boyle, 4th Earl of Cork, Sackville Tufton, 7th Earl of Thanet and Charles Bruce, 4th Earl of Elgin .