books.google.com - What was a mark? Livery of seisin? Letters patent? This remarkable Dictionary of Irish Local History will be able to tell you....https://books.google.com/books/about/Byrne_s_Dictionary_of_Irish_Local_Histor.html?id=LKJnAAAAMAAJ&utm_source=gb-gplus-shareByrne's Dictionary of Irish Local History
About the Author Joseph J. Byrne, MCSE, MCNE, ASE, and CNP, is a member of the Network+ exam objectives team, IEEE, and AIP. An IT professional with more than 20 years of experience, he works as a senior systems engineer at Marco Business Products, Inc.
Byrne's Dictionary of Irish Local History: From Earliest Times to C. 1900