Walter FitzOther
He was a feudal baron of Eton in Buckinghamshire ( now in Berkshire ) and was Constable of Windsor Castle in Berkshire ( directly across the River Thames from Eton ) , a principal royal residence of King William the Conqueror , and was a tenant-in-chief of that king of 21 manors in the counties of Berkshire , Buckinghamshire , Surrey , Hampshire and Middlesex , as well as holding a further 17 manors as a mesne tenant in the same counties . 
<triplet> Eton <subj> River Thames <obj> located in or next to body of water <triplet> Buckinghamshire <subj> Berkshire <obj> shares border with <subj> Berkshire <obj> shares border with <triplet> Berkshire <subj> Buckinghamshire <obj> shares border with <subj> Buckinghamshire <obj> shares border with <triplet> River Thames <subj> Buckinghamshire <obj> located in the administrative territorial entity <subj> Berkshire <obj> located in the administrative territorial entity <subj> Berkshire <obj> located in the administrative territorial entity <subj> Buckinghamshire <obj> located in the administrative territorial entity <subj> Surrey <obj> located in the administrative territorial entity <triplet> Berkshire <subj> Buckinghamshire <obj> shares border with <subj> Buckinghamshire <obj> shares border with <triplet> Buckinghamshire <subj> Berkshire <obj> shares border with <subj> Berkshire <obj> shares border with