Fort Casimir
| New Netherland series |
|---|
| Exploration |
| Fortifications: |
| Settlements: |
| The Patroon System |
|
| People of New Netherland |
| Flushing Remonstrance |
Fort Casimir or Fort Trinity was a Dutch fort in the seventeenth-century colony of New Netherland. It was located on a no-longer existing barrier island at the end of Chestnut Street in what is now New Castle, Delaware.