After the subjection of Cölln and neighbouring Berlin by the new Hohenzollern Prince-Elector Frederick Irontooth of Brandenburg in 1442/1448, and his abolition of their union and semi-autonomy, he seized Cölln's feudal seniority over the Kreuzberg and the surrounding area in his favour. However, the prince-elector soon later sold the vineyards on the slope east of the houses on today's Heimstraße to private owners, mostly Cölln burghers, but kept those west of it including the Kreuzberg.