Thus , he became the ancestor of the two lines of the House of Schwarzburg that survived until the 20th century : Schwarzburg - Sondershausen and Schwarzburg - Rudolstadt .
After his death , the County of Schwarzburg was divided among his four sons .
He became the ancestor of the two lines of the County of Schwarzburg     that survived until the 20th century : Schwarzburg - Sondershausen and Schwarzburg - Rudolstadt .
After his death , the County of Schwarzburg was divided among his four sons .