Emperor's oak, Natural monument in Friedenau, Berlin, Germany.

The Emperor's oak stands on a 70-metre-square plaza in Friedenau, formerly called Rondell. The original oak, planted on 22 March 1879, was replaced in 1883 after being damaged in protests against Bismarck's anti-socialist laws. A brass plaque unveiled on 19 September 2004 marks the tree.

Gustav Schenk, publisher of the Royal Secret Supreme Court Book Printing House and one of Friedenau's first settlers, planted the oak on 22 March 1879 for Kaiser Wilhelm I's golden wedding and 82nd birthday. The original tree, from Prince Friedrich Karl's Dreilinden nursery, was badly damaged in protests against Bismarck's Anti-Socialist Laws and replaced in 1883.

The square where the oak stands was called Rondell before 1879; locals then named it Kaisereiche after the tree. The name is unofficial, yet the nearby BVG bus stop and taxi rank at Rhein- and Moselstraße use it, and a planned U-Bahn station on the 1960s Line 10 was to bear it too.

The oak stands on a 70-metre-square traffic island at the corner of Rheinstrasse and Moselstrasse. The nearby BVG bus stop and the taxi rank at that corner both carry the name Kaisereiche. The square is not an officially dedicated street space, so look for the tree itself rather than a street sign.

The oak honours Kaiser Wilhelm I: it was planted on 22 March 1879 for his golden wedding to Augusta and his 82nd birthday. The first tree was so badly damaged in protests against Bismarck's anti-socialist laws that it was replaced in 1883, so the 2004 "125th birthday" marked a tree only 121 years old.