Topcliffe and Cock Lodge in Yorkshire was the major seat of the Percies until they purchased Alnwick in 1309. I’ll be adding information to this page at some point so in the meantime here is a link to a very fine book, The Millennium Book of Topcliffe written by John Graham Esq,. You can download this gratis. It has a very good section on the Percies. http://www.topcliffe.net/