Jessica, I am descended from Sir Thomas de Tunstall and his wife, Eleanor Fitzhugh, also.But my line continues through their son, another Sir Thomas de Tunstall, who married Margaret Pudsey.I have no additional information on the descent to your family.
However, I think you might be interested to know that Eleanor Fitzhugh was a descendant of King Edward I (Plantagenet), and the ancestry of King Edward has been traced all the way back to the Roman Emperor Claudius, who was Emperor of Rome at the time of the birth of Christ.Detail of this ancestry has been published by me in 1997 in the book "Our Royal And Noble Ancestry."
The book also provides a copy of the Tunstall coat of arms and a picture of Thurland Castle as it appeared early in the last century.I also visited the castle a few years ago.
The book has been placed in several major genealogical libraries, including the LDS Library in Salt Lake City, where it has also been microfilmed, making it available for review at any Mormon church (Church of Jesus Christ of Latter Day Saints) family history center.
The book is also available for purchase if you decide you would like to have a copy.It may be ordered directly from me at 2114 Sieber Drive, Houston, TX 77017.The price is $30.00 each, including packaging and shipping.
If you would like to contact me, you may do so via e-mail at email@example.com.If you will tell me where you live, I will be happy to advise you of the nearest library to your home where you may find a copy of the book.If I can help you in any other way, please let me know.Hope this will be of interest to you.