Around 1113 [his father] Gruffudd ap Rhys King Deheubarth 1081-1137 (age 32) and [his mother] Gwenllian Aberffraw Queen Consort Deheubarth 1100-1136 (age 13) were married. She by marriage Queen Consort Deheubarth. She the daughter of King Gruffudd ap Cynan of Gwynedd (age 58) and Angharad Queen Consort Gwynedd 1065-1162 (age 48). He the son of Rhys ap Tewdwr King Deheubarth and Gwladys ferch Rhiwallon Mathrafal Queen Consort Deheubarth 1060-1137 (age 53). They were half second cousin once removed.
In 1130 Maredudd King Deheubarth was born to Gruffudd ap Rhys King Deheubarth 1081-1137 (age 49) and Gwenllian Aberffraw Queen Consort Deheubarth 1100-1136 (age 30).
In 1136 [his mother] Gwenllian Aberffraw Queen Consort Deheubarth 1100-1136 (age 36) died.
Florence of Worcester Continuation. 1137. [his father] Griffyth-ap-Rhys (age 56), king of Wales, perished through the artifices of his [his mother] wife.1
Note 1. So far from this being the case, Gwenlian, the wife of Griffythap-Rhys, prince of South Wales, a woman of a gallant spirit, seconded her husband's efforts for independence, and, in his absence, took the field in person at the head of her forces. See Giraldus Cambreensis Itin. i., c. iv., and Dr. Powell's notes: see also Warrington's History of Wales, p. 293.
In 1153 Maredudd King Deheubarth (age 23) succeeded King Deheubarth.
In 1155 Maredudd King Deheubarth (age 25) died.
[his father] Gruffudd ap Rhys King Deheubarth 1081-1137 succeeded King Deheubarth.
Paternal Family Tree: Aberffraw
Maternal Family Tree: Angharad Queen Consort Gwynedd 1065-1162
Kings Gwynedd: Great Grand Son of Cynan ab Iago King Gwynedd 1035-1063
Kings Seisyllwg: Great x 5 Grand Son of Hywel "Dda aka Good" King Seisyllwg King Deheubarth
Kings Powys: Great x 3 Grand Son of Maredudd ab Owain King Deheubarth King Powys King Gwynedd -999
Great x 4 Grandfather: Owain King Deheubarth -987
Great x 3 Grandfather: Einion Dinefwr
Great x 2 Grandfather: Cadell Dinefwr
Great x 1 Grandfather: Tewdwr ap Cadell Dinefwr
GrandFather: Rhys ap Tewdwr King Deheubarth
Father: Gruffudd ap Rhys King Deheubarth 1081-1137
Great x 3 Grandfather: Gwerystan ap Gwaithfoed Mathrafal
Great x 2 Grandfather: Cynfyn ap Gwersytan Mathrafal
Great x 3 Grandmother: Nest ferch Cadell ap Brochfael King Powys
Great x 1 Grandfather: Rhiwallon ap Cynfyn Mathrafal
Great x 4 Grandfather: Owain King Deheubarth -987
Great x 3 Grandfather: Maredudd ab Owain King Deheubarth King Powys King Gwynedd -999
Great x 2 Grandmother: Angharad ferch Maredudd
GrandMother: Gwladys ferch Rhiwallon Mathrafal Queen Consort Deheubarth 1060-1137
Maredudd King Deheubarth 1130-1155
Great x 4 Grandfather: Meurig ap Idwal Aberffraw
Great x 3 Grandfather: Idwal ap Meurig Aberffraw
Great x 2 Grandfather: Iago ab Idwal ap Meurig Aberffraw Prince Gwynedd 1005-1039
Great x 1 Grandfather: Cynan ab Iago King Gwynedd 1035-1063
GrandFather: King Gruffudd ap Cynan of Gwynedd
Mother: Gwenllian Aberffraw Queen Consort Deheubarth 1100-1136
Great x 4 Grandfather: Einion Dinefwr
Great x 3 Grandfather: Gronwy Ap Einion Dinefwr
Great x 2 Grandfather: Edwin of Tegeingl
Great x 4 Grandfather: Edwin Earl of Mercia
Great x 3 Grandmother: Ethelfleda or Aldgyth of Mercia
Great x 1 Grandfather: Owain ab Edwin
Great x 4 Grandfather: Gwerystan ap Gwaithfoed Mathrafal
Great x 3 Grandfather: Cynfyn ap Gwersytan Mathrafal
Great x 4 Grandmother: Nest ferch Cadell ap Brochfael King Powys
Great x 2 Grandmother: Iwerydd Mathrafal
Great x 4 Grandfather: Sitric Silkbeard King Dublin
Great x 3 Grandmother: Unnamed d Sitric Silkbeard King Dublin
GrandMother: Angharad Queen Consort Gwynedd 1065-1162