 Complete the following phrase:  George Luttrell died without children, and Dunster Castle passed to his brother Francis, who survived the political turmoil of both the Commonwealth years and the Restoration of Charles II to power in 1660. Francis heir, another Francis, married a wealthy heiress worth 2,500 a year 331,000 in 2009 values and with this income set about modernising the castle during the 1680s, in particular building a grand staircase in the latest style. Francis was a colonel in the local militia and in 1688 backed William of Oranges 