Günther XXI, Count of Schwarzburg-Sondershausen German count (1450–1484) Parents Henry XXI, Count of Schwarzburg-Blankenburg Elisabeth of Cleves, Countess of Schwarzburg-Blankenburg Children Margarethe, Gräfin von Schwarzburg-Blankenburg Henry XXII, Count of Schwarzburg-Sondershausen Catherine of Schwarzburg-Blankenburg Siblings Hendrik XXVII van Schwarzburg Günther XX, Count of Schwarzburg-Arnstadt Günther XXII, Count of Schwarzburg-Blankenburg Partners Katharina von Querfurt