Here's why:
* 1813: During the Napoleonic Wars, the Princely House of Salm-Reifferscheid-Dyck lost its territories in the Rhineland to Prussia. This marked the end of their sovereignty.
* Later History: The family continued to exist as a noble house, though without a sovereign principality. The family name "Salm-Reifferscheid-Dyck" has been used by descendants, even though the principality no longer exists.
It's worth noting that while the principality ended in 1813, the family line itself continues.