Albert II, Margrave of Brandenburg
Albert II, Margrave of Brandenburg( – 25 February 1220) was a member of the House of Ascania.
He was Margrave of Brandenburg from 1205 until his death in 1220.
Hedwig of Habsburg
Hedwig( or" Heilwig"; – 1303), a member of the royal House of Habsburg, was Margravine of Brandenburg from 1279 until 1285/1286, by her marriage with the Ascanian margrave Otto VI of Brandenburg- Salzwedel.
George Frederick Charles, Margrave of Brandenburg-Bayreuth
George Frederick Charles, Margrave of Brandenburg- Bayreuth( 19 June 1688 at Oberzulzbürg Castle, near Mühlhausen – 17 May 1735 in Bayreuth), was a German prince, member of the House of Hohenzollern, nominal Margrave of Brandenburg- Bayreuth- Kulmbach( 1708 – 35) and Margrave of Brandenburg- Bayreuth( 1726–35).
Frederick I, Elector of Brandenburg
Frederick( Middle High German:" Friderich," Standard German:" Friedrich"; 21 September 1371 – 20 September 1440) was the last Burgrave of Nuremberg from 1397 to 1427( as Frederick VI), Margrave of Brandenburg- Ansbach from 1398, Margrave of Brandenburg- Kulmbach from 1420, and Elector of Brandenburg( as Frederick I) from 1415 until his death.
He became the first member of the House of Hohenzollern to rule the Margraviate of Brandenburg.
Beatrice of Bohemia
Beatrice of Bohemia (1225–1290) was a daughter of King Wenceslaus I of Bohemia and his wife Kunigunde of Hohenstaufen.
She married Margrave Otto III and was the mother of:
Otto VI, Margrave of Brandenburg-Salzwedel
Otto VI, Margrave of Brandenburg-Salzwedel, nicknamed "Otto the Short" (– 1303 in Lehnin)
was a member of the House of Ascania and co-ruler of Brandenburg.
He was a son of Margrave Otto III and his wife, Beatrice of Bohemia.
In 1267, his father died and Otto succeeded as Margrave, jointly with his brothers and cousins.
In 1279, Otto married Hedwig, the daughter of King Rudolph I of Germany.
This marriage remained childless.
In 1286, he abdicated and became a Knight Templar.
Later, he became a Cistercian monk.
Margaret of Brandenburg
Margaret of Brandenburg- Salzwedel( born ca. 1270 – died 1 May 1315) was a German noblewoman member of the House of Ascania and by her two marriages Duchess of Greater Poland( during 1293 – 1296), Queen of Poland( during 1295 – 1296) and Duchess of Saxe- Lauenburg( during 1302 – 1308).
She was the youngest child and second daughter of Albert III, Margrave of Brandenburg- Salzwedel and Matilda of Denmark, daughter of King Christopher I.
Frederick, Margrave of Brandenburg-Bayreuth
Frederick, Margrave of Brandenburg- Bayreuth( May 10, 1711 in Weferlingen – February 26, 1763 in Bayreuth), was a member of the House of Hohenzollern and Margrave of Brandenburg- Bayreuth.
He was the eldest son of Georg Frederick Karl, nominal Margrave of Brandenburg- Bayreuth- Kulmbach, by his wife Dorothea of Schleswig- Holstein- Sonderburg- Beck.
Matilda of Brandenburg, Duchess of Poland
Matilda of Brandenburg( b. ca. 1270 – d. bef. 1 June 1298), was a German princess member of House of Ascania and by marriage Duchess of Wrocław and High Duchess of Poland.
She was the second daughter of Otto V the Long, Margrave of Brandenburg- Salzwedel, by his wife Judith of Henneberg, daughter of Count Herman I, Count of Henneberg and heiress of Coburg and Schmalkalden.
Frederick VI, Margrave of Baden-Durlach
Frederick VI, Margrave of Baden- Durlach( 16 November 1617 – 10 or 31 January 1677) was the Margrave of Baden- Durlach from 1659 until his death.

Question: Who is Otto Vi, Margrave Of Brandenburg-Salzwedel's maternal grandmother?
Answer: Kunigunde of Hohenstaufen