Sion ap Rhydderch

  Research Notes:

From the book Reifsnyder-Gillam Ancestry, Edited by Thomas Allen Glenn at the request of Howard Reifsnyder, privately printed, Philadelphia, 1902, provided by http://books.google.com, p. 45, footnote 5:
"Note that Rowland Ellis in his pedigree of 1697, calls Catherine daughter of "Sion ap Rhydderch," i.e., John ap Rhydderch, which, however, is clearly a clerical error, as Sion ap Rhydderch was her brother."