Guret of Alt Clut (died 658),ruler of Alt Clut, the Brythonic kingdom later known as Strathclyde
Gwriad ap Merfyn or ap Rhodri was a 9th-century prince of Gwynedd in northern Wales.
Merfyn claimed descent from Llywarch Hen through him, and the royal pedigree in Jesus College MS. 20 says that Gwriad was the son of Elidyr, who bears the same name as his ancestor, the father of Llywarch Hen, Elidyr lydanwyn.