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Bartrum presents 3 pedigrees for this man:
(1)  Llewelyn aurdorchog ap Cynwrig ap Cynddelw gam ap Elgudy......
(2)  Idris ap Llewelyn aurdorchog ap Coel ap Gweirydd ap Cynddelw gam
(3)  Ednowian ap Bradwen ap Llewelyn aurdorchog ap Coel ap Gweirydd ap Cynddelw gam
In his notes, Bartrum says "Llewelyn Aurdorchog was born c. 1030 and was ancestor of families in Ial and Ystrad Alun.  I have suggested the correct pedigree can be obtained by combining the two versions, viz Llewelyn Aurdorchog ap Coel ap Gweirydd ap Cynwrig ap Cynddelw Gam." [1]
       It would appear that 2 generations are omitted in this list of ancestors
       Cynwrig has been omitted in this version of the pedigree.  Additionally, Llewelyn Aurdorchog did not have a son named Idris.  Idris was a son of Llewelyn Fychan ap Llewelyn Aurdorchog. [2]
      Contains the same omission as #2.  While we believe Ednowain ap Bradwen was descended from Llewelyn Aurdorchog, there were a number of intervening generations. [3]  Llewelyn DID have a son named Ednowain (sometimes cited as Owain) who was also called "aurdorchog". [4]
         We agree with the pedigree which Bartrum mentioned in his comments, but date the birth of Llewelyn Aurdorchog to c. 1005.  He served as penteulu for King Gruffudd ap Llewelyn (his reign was 1039-1063) and was probably the first-cousin of that king. We suspect his father, Coel ap Geeirydd, married the aunt of Gruffudd, a sister of previous King Llewelyn ap Seisyll, and was probably the penteulu of said King Llewelyn. [5]  The nickname "aurdorchog" means "with the gold torc".  From ancient times, Celtic battle-leaders wore a gold torc into battle, while the soldiers under their command wore torcs made of a base metal.
        Our dating of these men is: Llewelyn Aurdorchog (1005) ap Coel (975) ap Gweirydd (945) ap Cynwrig (915) ap Cynddelw Gam (880). The ancestry continues back to the warrior-bard Llywarch Hen and thence back to Coel Hen. [6]
[1]  "Early Welsh Genealogical Tracts", page 156 
[2]  Idris was born c. 1090 but virtually all citations omit the name of his father.
[3]  See our paper "Ednowain ap Bradwen" at the link below:
[4]  Dwnn ii, 243
[5]  See our paper "The Shropshire Walcot Family", Chart 1 and its notes, at the link below:
[6]  See our paper, "Pedigree of the Ancient Lords of Ial" at the link below: