| Place name (English): | Trecastell |
| Place name (local language): | |
| Place name (alt. local language): | |
| Place name (older spelling): | |
| Place name (other common spelling/language): | |
| Place type: | city/town |
| Is in the area of: | Aberffraw |
| Note: |
| 1 | Tudur Fychan (-September 1367), parents: Goronwy |