Kurš apprecējās ar Jutta av Sachsen (död 1287)?

Jutta av Sachsen, född omkring 1240, död 23 december 1287, var markgrevinna av Brandenburg i sitt 1255 ingångna äktenskap med markgreve Johan I av Brandenburg (död 1266/1267) och mor till danska drottning Agnes av Brandenburg. Jutta var dotter till hertig Albrekt I av Sachsen och Agnes av Thüringen (död före 1247).

John I, Margrave of Brandenburg ( c. 1213 – 4 April 1266) was from 1220 until his death Margrave of Brandenburg, jointly with his brother Otto III "the Pious".

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 into a Johannine and Ottonian parts. 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 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.