*Maelgwn "Hen" ("Fawr") ap Rhys
born before 1187 Carmarthenshire, Wales
died 1231

father:
*Rhys "Fychan" ap Gruffudd
born about 1129 Dynevor Castle, Llandilo, Carmarthenshire, Wales
died after 24 April 1197
buried St. David's, Pebidiog, Pembrokeshire, Wales

mother:
*Gwerful verch Llywelyn
born about 1135 Cil-y-cwm, Carmarthenshire, Wales

siblings:
unknown

spouse:
*Gwenllian verch Madog
born about 1130 Montgomeryshire, Wales

children:
*Maelgwn "Ieuanc" ("Fychan") ap Maelgwn
born Carmarthenshire, Wales
died 1257

biographical and/or anecdotal:

notes or source:
LDS
research of S. E. Oman Salt Lake City
According to this he married his step-mother.