About Teithwalch ap Cyndegg
See "Lewis Patriarchs of Early Virginia and Maryland," by Robert Lewis, and "The Welsh Lineage of John Lewis," by Grace Moses.
Link to excerpts: http://www.senclewises.com/history2.html
See also Burkes Landed Gentry, under Prichard.
(April 23, 2016; Anne Brannen, curator)
Please see Darrell Wolcott: "Bartrum's Pedigrees of the Welsh Tribal Patriarchs" - # 15 - Maenyrch; http://www.ancientwalesstudies.org/id183.html. (Steven Ferry, March 13,2107.)