Earl of Plymouth's estate
The Windsor-Clive family's Glamorgan estate, also called the Plymouth or St Fagans estate, which owned the mineral rights over Waunwyllt and Penylan south of Merthyr Tydfil and leased coal levels on terms protecting its own ironworks.
Mines operated
| Mine | Region | Years |
|---|---|---|
| Waunwyllt Level | Merthyr Tydfil | ?–? |
Record created: 28 September 2026 · Last researched: 28 September 2026