Submitted Arianwyn O'Donell in Deodar in the 1990s. apparently never registered ?

Now Arianwen ferch Rhydderch, documentation needs to be recreated.

Bartrum, Early Welsh Genealogical Tracts, PB 3[b] (p.82) cites <Arianwen verch Vrychan gwraic Ierwerth hirvlawd ap Tegonwy ap Teon>.

Genuine Welsh name meaning brown (silver?).
Rhydderch is a Welsh masculine given name dated in this spelling to 1564. From the registration of Gwenllian verch Rhydderch Annwyl (March 2010, Middle):
  • Noir Licorne found "... dated to 1564 in Shropshire (ancestry.com): '21 Feb 1564 John ap David ap Rys, of St. Martyns. Goshipps, John ap David ap Howell, Rhydderch ap Eignion & Elnor Hanmer chr." As this citation is from extracted records, not general genealogical information, and is a faithful direct transcription as best we can tell, this documentation is sufficient to support the form Rhydderch as a 16th C form. Therefore, this name is registerable as submitted.
Documentation comes from an email from Arval of the Academy of Saint Gabriel, in respond to the name <Ruaidhri Mac Morgan>. The email suggests <Rhydderch ap Morgan> would be "a fine 16th century Welsh name", based on http://www.s-gabriel.org/2308 (suggests Rhydderch is 13th Century), http://www.s-gabriel.org/2987 (Rhydderch dated to 1600), and http://www.s-gabriel.org/names/tangwystyl/welsh16.html (dated to the 16th Century) (no copies of any of these were provided).

Device
Per bend sinister argent and vert, in bend a winged elephant statant azure and a mulberry branch bendwise sinister Or.