Llywelyn the Last | Madog ap Maredudd | Gruffydd ap Llywelyn | Maredudd ab Owain | Llywelyn the Great | Llywelyn | Selyf ap Cynan | Morgan Llywelyn | Morgan ap Maredudd | Maredudd ap Cynan ab Owain Gwynedd | Madog ap Llywelyn | Llywelyn the Elder ap Maredudd ap Cynan ab Owain Gwynedd | Llywelyn Siôn | Llywelyn Bren | Llywelyn ap Dafydd | John "Wynn" ap Maredudd | Gruffudd ap Cynan |
Madog was the son of Llywelyn ap Maredudd, the last vassal Lord of Meirionydd who had been deprived of his patrimony in 1256 for opposing Llywelyn ap Gruffudd the Prince of Wales at the Battle of Bryn Derwin.