<p>Elizabeth was the first Duchess of Northumberland and established the domestic rules of this dynasty that has ruled for over 700 years. Controlling a household of great power and prestige, she laid down the guidelines in her 'Household Book' that created a framework from which to run Alnwick Castle and that, to this day, contains advice that is not only fascinating, but also remains highly relevant. The 'Household Book of the noble family of t...