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.
Anne of Bohemia (1290–1313)
Anne of Bohemia( 1290 –1313) was the eldest surviving daughter of Wenceslaus II of Bohemia and Poland and his first wife Judith of Habsburg.
Her siblings included Elisabeth of Bohemia and Wenceslaus III of Bohemia.
Anne of Bohemia, Duchess of Austria
Anne of Bohemia( 27 March 1323 – 3 September 1338), also known as" Anna of Luxembourg", was a daughter of John of Bohemia and his first wife, Elizabeth of Bohemia.
Anne was a member of the House of Luxemburg.
Beatrice of Naples
Beatrice of Naples( 16 November 1457 – 23 September 1508), also known as Beatrice of Aragon, was twice Queen of Hungary and of Bohemia by marriage to Matthias Corvinus and Vladislaus II.
She was the daughter of Ferdinand I of Naples and Isabella of Clermont.
Elizabeth of Bohemia (1292–1330)
Elizabeth of Bohemia( 20 January 1292 – 28 September 1330) was a princess of the Bohemian Přemyslid dynasty who became queen consort of Bohemia as the first wife of King John the Blind.
She was the mother of Emperor Charles IV, King of Bohemia.
Margaret of Bohemia, Duchess of Bavaria
Margaret of Bohemia( 1313–1341) was the daughter of King John of Bohemia by his first wife Elisabeth of Bohemia( 1292–1330).
Beatrice of Silesia
Beatrice of Silesia( also known as Beatrice of Świdnica;,; 1290 – 25 August 1320) was a Polish princess member of the House of Piast in the Silesian branch of Jawor- Świdnica and by marriage Duchess of Bavaria and German Queen.
Wenceslaus I, Duke of Luxembourg
Wenceslaus I( also" WenceslasVenceslasWenzel", or" Václav", often called Wenceslaus of Bohemia in chronicles)( 25 February 1337 – 7 December 1383) was the first Duke of Luxembourg from 1354.
He was the son of John the Blind, King of Bohemia, and Beatrice of Bourbon.
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:
Sophia of Bavaria
Sophia of Bavaria (1376 – 4 November 1428) was a Queen of Bohemia and the spouse of Wenceslaus, King of Bohemia and King of the Romans.
She was briefly interim regent of Bohemia after the death of Wenceslaus in 1419.

Question: Where did Beatrice Of Bohemia's husband die?
Answer: Brandenburg an der Havel