Question: Where did Beatrice Of Bohemia's husband die?

Knowledge 1: 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: [SEP] Knowledge 2: 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.
Knowledge 1: 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. [SEP] Knowledge 2: 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.
Knowledge 1: 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: [SEP] Knowledge 2: 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.

Answer: Brandenburg an der Havel