Question: Who is Prince Karl Anton August Of Schleswig-Holstein-Sonderburg-Beck's paternal grandmother?
Sentence (from "Frederick Louis, Duke of Schleswig-Holstein-Sonderburg-Beck"): Frederick Louis of Holstein- Sonderburg- Beck( 6 April 1653 – 7 March 1728) was a Duke of Schleswig- Holstein- Sonderburg- Beck and field marshal of the Prussian Army.
Relevant evidence: No