Waldemar, Margrave of Brandenburg-Stendal
Waldemar the Great( – 14 August 1319), a member of the House of Ascania, was Margrave of Brandenburg- Stendal from 1308 until his death.
He became sole ruler of the Margraviate of Brandenburg upon the death of his cousin John V of Brandenburg- Salzwedel in 1317.
Waldemar is known as the last in the line of Ascanian margraves starting with Albert the Bear in 1157; he was only succeeded by his minor cousin Henry II, who died one year later.
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.
Otto III, Margrave of Brandenburg
Otto III, nicknamed "the pious" (1215 – 9 October 1267 in Brandenburg an der Havel) was Margrave of Brandenburg jointly with his elder brother John I until John died in 1266.
Otto III then ruled alone, until his death, the following year.
The reign of these two Ascanian Margraves was characterized by an expansion of the Margraviate, which annexed the remaining parts of Teltow and Barnim, the Uckermark, the Lordship of Stargard, the Lubusz Land and parts of the Neumark east of the Oder.
They consolidated the position of Brandenburg within the Holy Roman Empire, which was reflected in the fact that in 1256, Otto III was a candidate to be elected King of the Germans.
They founded several cities and developed the twin cities of Cölln and Berlin.
They expanded the Ascanian castle in nearby Spandau and made it their preferred residence.
Before their death, they divided the Margraviate in a "Johannine" and an "Ottonian" part.
The Ascanians were traditionally buried in the Lehnin Abbey in the Ottonian part of the country.
In 1258, they founded a Cistercian monastery named "Mariensee", where members of the Johannine line could be buried.
In 1266, they changed their mind and founded a second monastery, named "Chorin", 8 km southwest of Mariensee.
John was initially buried at Mariensee; his body was moved to Chorin in 1273.
After the Ottonian line died out in 1317, John I's grandson Waldemar reunited the Margraviate.
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.
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.
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 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.
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.
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.

Question: When did Otto Vi, Margrave Of Brandenburg-Salzwedel's father die?
Answer: 9 October 1267