Castle Howard by Hawksmoor. The grounds of Castle Howard are also used as part of at least two charity running races during the year. Located on the Estate, but operating separately to the house and gardens and run by an entirely independent charitable trust, is the Yorkshire Arboretum. Originally created through the enthusiasm and partnership of George Howard (Lord Howard of Henderskelfe) and James Russell, over a period of eighteen years, from 1975 to 1992, it was opened to the public for the first time in 1999 and a new Visitor Centre opened in 2006.The arboretum's extensive and important collection of 6,000
Clun Castle of 1400–15, with Thomas playing a key role in suppressing the revolt; the castle was refortified and saw some service against the Welsh rebels led by Owain Glyndŵr. By the 16th century, the antiquarian John Leland observed the increasingly ruined nature of Clun Castle. Philip Howard, the 20th earl of Arundel, died in 1595 whilst under attainment, and James I gave Clun Castle to Henry Howard, 1st Earl of Northampton. The castle was abandoned by the time of the English Civil War of 1642–46 and saw no military action; it was slighted by Parliament, however, in 1646 to prevent any