Family/Spouse: Unknown. [Group Sheet] [Family Chart]

Other Events and Attributes:

• Appointments / Titles: King of Powys
• FSID: LV6Y-XM7

Family/Spouse: Unknown. [Group Sheet] [Family Chart]

Other Events and Attributes:

• FSID: LKVQ-8HW

Family/Spouse: Unknown. [Group Sheet] [Family Chart]

Other Events and Attributes:

• FSID: LV6Y-6B5

Notes:

Gwyddno Garanhir was the supposed ruler of a sunken land off the coast of Wales, known as Cantre'r Gwaelod. He was the father of Elffin ap Gwyddno, the foster-father of the famous Welsh poet, Taliesin, in the legendary account given in the late medieval Chwedl Taliesin (Ystoria Taliesin/Hanes Taliesin; "The Tale of Taliesin").

The Thirteen Treasures of the Island of Britain (Welsh: Tri Thlws ar Ddeg Ynys Prydain) are a series of items in late medieval Welsh tradition. Lists of the items appear in texts dating to the 15th and 16th centuries. Most of the items are placed in the Hen Ogledd or "Old North", the Brittonic-speaking parts of what is now southern Scotland and Northern England; some early manuscripts refer to the whole list specifically as treasures "that were in the North". The number of treasures is always given as thirteen, but some later versions list different items, replacing or combining entries to maintain the number. Later versions also supplement the plain list with explanatory comments about each treasure.

The basket of Gwyddno Garanhir is one of the Thirteen Treasures of the Island of Britain. According to tradition, Gwyddno was the lord of Cantre'r Gwaelod (English: The Lowland Hundred) in what is now Cardigan Bay. His chief fortress was said to have been Caer Wyddno (English: the Fort of Gwyddno), located somewhere to the north-west of modern-day Aberystwyth. The whole kingdom was protected from the sea by floodgates, which had to be shut before high tide. One day the keeper of the floodgates, Seithenyn, was drunk and failed to close them, with the result that the sea rushed in and covered the land.

Stories of the drowned lands of Gwyddno appear to have arisen from the identification of natural submarinal ridges as the remains of sea walls. However, tradition also assigns Gwyddno a landlocked portion of his kingdom to which he was able to flee. He was called 'King of Ceredigion' by the 18th century Welsh antiquarian, Iolo Morganwg, well known for his literary forgeries, but he does not appear in the Old Welsh pedigrees for that kingdom. He is identified with a number of different historical Gwyddnos in various sources. 16th century writers favoured Gwyddno ap Clydno, the late 6th century King of Meirionydd, who is perhaps the most likely candidate.

In Susan Cooper's The Dark is Rising series, Gwyddno is the king of the Lost Lands in Silver on the Tree.

Gwyddno married verch Cadell Deyrnilyg, Ystradwen in 1000 in Glamorgan, Wales. Ystradwen was born in 975 in Wales; died in DECEASED in Wales. [Group Sheet] [Family Chart]