| Year | Type | Name as Recorded | Location | Office/Status | Full Record |
|---|---|---|---|---|---|
| 1778 | Subsc | Williams, John | Ystradmeirig Free Grammar School / | Schoolmaster | View |
| 1778 | Appt(Licensing) | Williams, John | Ystradmeirig Free Grammar School / | Schoolmaster | View |
| 1806 | Vac | Williams, John | Ystradmeiric / Free Grammar Schoo lof Lledrod | Schoolmaster | View |
| 1818 | Vac(natural death) | Williams, John | Ystradmeiric Free Grammar School / | Schoolmaster | View |