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.
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A final battle between Madog's men and those of the English crown occurred at the battle of Maes Moydog in Powys in 1295.
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The sons of Dafydd Goch also laid claim to the title, although illegitimately.
Llywelyn the Last | Madog ap Maredudd | Gruffydd ap Llywelyn | Llywelyn the Great | Llywelyn | Morgan Llywelyn | Madog II ap Gruffydd, Lord of Dinas Bran | Madog ap Llywelyn | Madog ap Gruffydd Maelor | Llywelyn the Elder ap Maredudd ap Cynan ab Owain Gwynedd | Llywelyn Siôn | Llywelyn Bren | Llywelyn ap Dafydd | Gruffydd II ap Madog, Lord of Dinas Bran |
He was the leader of the Glamorgan insurgents during the rising of Madog ap Llywelyn in 1294-5; under his leadership, the Welsh captured castles at Kenfig, Llangibby, and Morlais.