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." 
would appear that 2 generations are omitted in this list of ancestors
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. 
the same omission as #2. While we believe Ednowain ap Bradwen was descended from Llewelyn Aurdorchog, there were a number
of intervening generations.  Llewelyn DID have a son named Ednowain (sometimes cited as Owain) who was also
called "aurdorchog". 
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.  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. 
Welsh Genealogical Tracts", page 156
was born c. 1090 but virtually all citations omit the name of his father.
 See our
paper "Ednowain ap Bradwen" at the link below:
 See our
paper "The Shropshire Walcot Family", Chart 1 and its notes, at the link below:
 See our
paper, "Pedigree of the Ancient Lords of Ial" at the link below: