Schildhorn Saw

The Schildhorn legend is about the Slavic prince Jaxa von Köpenick, who is said to have fled from Albrecht the Bear through the Havel in 1157, the year the Mark of Brandenburg was founded. When Jaxa was in danger of drowning, he invoked the hitherto hated "Christian God" in his distress and, out of gratitude for his rescue, hung his shield and horn on a tree and professed Christianity. Since then, the headland on which he saved himself has been called Schildhorn. The Schildhorn has belonged to Berlin since 1920. The legend symbolically reflects the founding myth of the Mark Brandenburg: the transition from Slavic to German rule.
In its original oral tradition and in its first writings, the folk tale did not revolve around Jaxa, nor did it contain the conversion aspect, nor did it play on the shield horn. These contents gradually found their way into the presentation in the first half of the 19th century. The name Schildhorn was also mentioned in a document as early as 1590 and is very likely based on a Slavic water name. Nevertheless, even in the 21st century, many depictions and information boards on site trace the naming of the Schildhorn back to the legend and thus turn this part of the saga into a modern historical myth.

Wikipedia