Marsli verch Ieuan Llwyd

   Another name for Marsli was Marli ferch Eynon.

  Research Notes:

Source: http://www.varrall.net/pafg43.htm#947

Was she the wife of some other Llywelyn ap Heilen?

From http://www.abergwyngregyn.co.uk/html/body_bodsilin.html :
"Bodsilin now lies within the parish of Aber on its boundary with Llanfairfechan, close to Iron Age fort of Maes-y-Gaer, which overlooks the village of Aber and the traditional site of the court of the princes of Gwynedd. Included in Bodsilin are the lands and Farmstead of Hafod-y-Celyn, the site of which is supposed by some to be connected with the princes. The house (fifteenth century) may have been preceded by a royal hunting-lodge or secondary residence for use when imminent invasion rendered the Llys within the Royal Manor unsafe. In the period of the princes Bodsilin was separate from the Manor of Aber, which was inhabited by serfs with responsibilities for cultivating the Prince's home farm and maintaining his court. Bodsilin was a free Ville or township (a term generally implying a considerable area comprising several hamlets). In the time of Llywelyn the Great it was part of the extensive territories of Iarddur, Lord of Llechwedd Ucha, and a descendant of Maelgwn Gwynedd. Five generations later it was still in his family and belonged to the large estate of Ieuan Llwyd of Gorddinog, Descendants of larddur remained in possession of Bodsilin until the end of the sixteenth century at least. Sexton map of Caernarfonshire, 1578, shows 'Bodsilin' as the only place of note in the district apart from the parish churches of Aber and Llanfairfechan.
"Ieuan Llwyd's daughter Marsli seems to have had Bodsilin as her portion. Her grandson, Rhys Fychan, was a personal squire to King Richard III, and owned many estates, having bought Aber and Wig from the King. At the battle of Bosworth (1485), where William ap Gruffydd brought a troop of horse to the aid of Henry Tudor, King Richard despairingly drank the health of his faithful attendant Rhys Fychan immediately before his own death in battle. Rhys lost almost all his lands (Aber reverting to the Crown) and William ap Gruffydd became Sheriff of Caernarfonshire, 1485-1500, having founded the fortunes of his family and its tradition of loyalty to the Tudor dynasty.
"Bodsilin was originally Bodscalyn but has been Bod silin, Botfylyir, Botsylyn, in the fourteenth century. It became 'Bodsilin' only in the mid-sixteenth century, and even in the early seventeenth century the old name was still used occasionally.

Marsli married Llywelyn ap Heilyn of Bodorgan. (Llywelyn ap Heilyn of Bodorgan was born circa 1400.)