Question: Who is the paternal grandfather of Elisabeth Of Greater Poland, Duchess Of Bohemia?

Knowledge 1: Elisabeth of Greater Poland, Duchess of Bohemia
Elisabeth of Greater Poland( 1152 – 2 April 1209) was a Polish princess of the House of Piast and, by her two marriages, Duchess of Bohemia and Margravine of Lusatia.She was a daughter of Mieszko III the Old, Duke of Greater Poland and from 1173 High Duke of Poland, by his first wife, Elisabeth, daughter of King Béla II of Hungary.Elisabeth's birthdate is unknown.Medieval sources do not even indicate whether the Hungarian princess was her mother.Elizabeth is believed to have been her daughter only because both had the same name.Some scholars report that Elizabeth was born about 1152 or 1154. [SEP] Knowledge 2: Mieszko III the Old
Mieszko III the Old( c. 1126/27 – 13 March 1202), of the royal Piast dynasty, was Duke of Greater Poland from 1138 and High Duke of Poland, with interruptions, from 1173 until his death.He was the fourth and second surviving son of Duke Bolesław III Wrymouth of Poland, by his second wife Salomea, daughter of the German count Henry of Berg- Schelklingen.
Knowledge 1: Elisabeth of Greater Poland, Duchess of Bohemia
Elisabeth of Greater Poland( 1152 – 2 April 1209) was a Polish princess of the House of Piast and, by her two marriages, Duchess of Bohemia and Margravine of Lusatia.She was a daughter of Mieszko III the Old, Duke of Greater Poland and from 1173 High Duke of Poland, by his first wife, Elisabeth, daughter of King Béla II of Hungary.Elisabeth's birthdate is unknown.Medieval sources do not even indicate whether the Hungarian princess was her mother.Elizabeth is believed to have been her daughter only because both had the same name.Some scholars report that Elizabeth was born about 1152 or 1154. [SEP] Knowledge 2: Elisabeth of Bohemia (1358–1373)
Elisabeth of Bohemia( 1358–1373) was the daughter of Charles IV, Holy Roman Emperor, and Anne of Schweidnitz.She was named after her paternal grandmother, Elisabeth of Bohemia( 1292–1330).She had a brother, Wenceslaus, King of the Romans, and one half sister, Katharine of Bohemia, whose mother was Blanche of Valois who was Charles IV's previous wife.Elisabeth had another half sister who was the daughter of Blanche, Margaret of Bohemia but she died in 1349, so Elisabeth never knew her.After the death of her mother, Charles remarried for the last time to Elizabeth of Pomerania.Elisabeth gained six half- siblings from the marriage: Anna, Queen of England, Sigismund, Holy Roman Emperor, Margaret" the younger" of Bohemia, John of Görlitz, Charles, and Henry.Elisabeth married when she was only eight in 1366 to Albert III, Duke of Austria.Elisabeth and Albert had no children and she died aged only fifteen in 1373; she was buried with Albert's parents in Gaming Charterhouse in Lower Austria.Her husband remarried to Beatrix of Nuremberg and they were parents of Albert IV, Duke of Austria.
Knowledge 1: Elisabeth of Greater Poland, Duchess of Bohemia
Elisabeth of Greater Poland( 1152 – 2 April 1209) was a Polish princess of the House of Piast and, by her two marriages, Duchess of Bohemia and Margravine of Lusatia.She was a daughter of Mieszko III the Old, Duke of Greater Poland and from 1173 High Duke of Poland, by his first wife, Elisabeth, daughter of King Béla II of Hungary.Elisabeth's birthdate is unknown.Medieval sources do not even indicate whether the Hungarian princess was her mother.Elizabeth is believed to have been her daughter only because both had the same name.Some scholars report that Elizabeth was born about 1152 or 1154. [SEP] Knowledge 2: Anna of Greater Poland
Anna of Greater Poland( b. 1253 – d. aft. 26 June 1295), was a Greater Poland princess member of the House of Piast and abbess at Owińska.She was the third daughter( twin with Euphemia) of Przemys ł I, Duke of Greater Poland and Poznań, by his wife Elisabeth, daughter of Henry II the Pious, Duke of Wrocław.She named after her maternal grandmother, Anna of Bohemia.

Answer: Bolesław III Wrymouth