Günther XII of Schwarzburg-Blankenburg - 24 Oct 1308 (b. 1250) Parents Irmgard Günther IX of Schwarzburg-Blankenburg Children Günther XVIII Heinrich IX of Schwarzburg Irmgard von Schwarzburg Siblings Henry VI of Schwarzburg Adelheid of Schwarzburg-Blankenburg Albert of Schwarzburg Partners Gräfin Mechtild von Käfernburg