When was the law that considers the Schwerin branch itself extict compiled?
Duchess Donata of Mecklenburg:  Since there are no males left in the family, the Schwerin branch itself is considered extinct due to the Salic law of succession, leaving Mecklenburg-Strelitz as the only remaining line of the House of Mecklenburg. Salic law: Salic law ( or ; Latin: "Lex Salica" ), or Salian Law, was the ancient Salian Frankish civil law code compiled around AD 500 by the first Frankish King, Clovis.
around AD 500