There is a William Yellan, christened abt 1601 in Devon, died 1679 (Will proved 8 Nov 1679), (probably not in our line, because he married a Rebecca); father, Thomas Yellan, born abt 1581, died 1645 (Will proved 5 Jul 1645); and mother, Mary Liston, married 06 AUG 1599, South Brent, Devon (Record submitted after 1991 by a member of the LDS Church). This record ties into the Yellands from the book, "Feudalism to Freedom, 400 Years of Yelland Family History."
Agnes is not in the IGI Batch C052351 with the rest of the Yellands from South Tawton, but is on Page 109 in the Parish Records she is shown and her parents are William and Willmot.