Sources:
1. Title: A History of Monmouthshire from the Coming of the Normans into Wales down to the Present Time
Author: Sir Joseph Bradney
Publication: The Hundred of Abergavenny, London, 1932
Page: vol 3, part 2, p. 218
2. Title: Archaeologia Cambrensis
Author: John Skinner, Cambrian Archaeological Association
Publication: LONDON: J. RUSSELL SMITH, 36, SOHO SQUARE. J. H. & J PARKER, 877, STRAND. 1863
3. Title: THE HERBERT FAMILY PEDIGREE
Author: Darrell Wolcott
Publication: http://www.ancientwalesstudies.org/id40.html