In the book Annals and antiquities of the counties and county families of Wales; Section V (Old and Extinct Families of Merionethshire) (published 1872) by Thomas Nicholas the descendants of Rhodri ab Owain are described; "Thomas (ap Rhodri ap Owain), Lord of Rhiw Llwyd, married Agnes, daughter of Einion ap Seissyllt, Lord of Mathafarn, widow of Owain Brogyntyn, Lord of Edeirnion.

From Robert, who did not marry till near eighty, descended the houses of Gwydir, Cesail Gyfarch, and Hafod Lwyfog; and Sir John the historian, his descendant, says, he was the elder brother; from James ab Maredudd, who was Constable of Cricieth, the families of Rhiwaedog, Clenenneu, Ystumcegid, Brynkir and Park.

The sons of Maredudd ap Hywel, Robert and James, took opposing sides during the last war of Welsh independence led by Owain Glyndŵr between 1400 and c.1412.

James ap Maredudd was killed during the continuance of this war at Caernarfon and his body evacuated by sea to be buried at Penmorfa.

Thomas Nicholas, in 1872, said of him; "William Lewis Anwyl, Esq., of Parc, High Sheriff of Merionethshire 1611, 1624, who married Elizabeth, daughter and co-heiress of Edward Herbert, Esquire, of Cemmaes, in Cyfeiliog, grandson of Sir Richard Herbert, Kt...By her he left a numerous offspring of 8 sons and 4 daughters."

He was interviewed by Byron Rogers for the book Three Journeys, an excerpt of which was published in Cambria Magazine in June 2011.