| The commote of Glynrhondda was coterminous with the earlier parish of Ystradyfodwg, but little is known of the Celtic saint Tyfodwg, or Dyfodwg after whom the parish is named. |
| The commote court later took over most of the functions of the cantref court. |
| The king raised an army to help Hubert, who began to build another castle in the commote of Ceri. |
| In the early Middle Ages, Glynrhondda was a commote of the cantref of Penychen in the kingdom of Morgannwg, a sparsely populated agricultural area. |
| On 12 December 1263 in the commote of Ystumanner, Gruffydd ap Gwenwynwyn did homage and swore fealty to Llywelyn. |
| However, in 1132 while on campaign in the commote of Nanheudwy, near Llangollen, 'victorious' Cadwallon was defeated in battle and slain by an army from Powys. |
