Marianne Landau was born Marianne Olga Ehrlich on January 23, 1886 in Berlin. Her parents were the physician, researcher and later Nobel Prize winner Paul Ehrlich and his wife Hedwig, née Pinkus. Marianne Olga Ehrlich was married to the mathematician Edmund Georg Hermann Yehezkel Landau, born on February 14, 1877 in Berlin. His parents were gynecologist Leopold Landau and his wife Johanna, née Jakoby.

Factory owner Eduard Marx, born in 1854, died in February 1904, leaving behind his wife Babette, née Rothschild, born in 1865, and their children-Grete-3 years old, Alfred-5 years old, Julius-9 years old and Leopold-15 years old.Due to Eduard Marx's early death, Babette Marx and the four children suddenly became the sole owners of the Gutmann & Marx mechanical belt and ribbon weaving mill.The widow, who was not only responsible for the upbringing but also for the company, found support in the former co-owner.

The name of the alley "Nahensteig" (or also "Narrensteig") is said to go back to the Hebrew name "Nahar" (Hebrew: Am Bach). In the Middle Ages, a branch of the Isar ran through today's Old Town and flowed in the area of today's Nahensteig. This Mühlbach ran several mills and rejoined the Isar; later the stream was blocked and the mills relocated. (More detailed description in the book by Georg Spitzllberger).

(c) Spitzlberger, Georg: Die Juden im mittelalterlichen Landshut, 1988, p. 189 Ewähnung im Zusammenhang mit dem "Judenbad"

Hugo Karl Hauser was born in Offenburg on 26 August 1880 and after completing his law studies, Dr. Hugo Karl Hauser came to Baden-Baden in 1908 as a partner in the law firm of Dr. Ernst Herrmann.

50 years after Adolf Hirsch built the new department store "Hermann Tietz Nachfolger" in 1900 - 1901, it became the property of "Hertie Waren- und Kaufhaus GmbH" (from 1994 Karstadt, currently "Galeria Karstadt Kaufhof") after its forced sale to the Brandl company.

Dr. Richard Landauer founds the "Delphin Verlag" in 1911 in Munich, in 1933 it is relocated to 55-57 Theaterstra e in Landshut due to the family's move to the parents-in-law (Cilly and Adolf Hirsch). Together with Helmut Teichner, Dr. Richard Landauer becomes one of the managing directors of the Hirsch department store (Hermann Tietz successor).

Dr. Richard Landauer founds the "Delphin Verlag" in 1911 in Munich, in 1933 it is relocated to 55-57 Theaterstra e in Landshut due to the family's move to the parents-in-law (Cilly and Adolf Hirsch). Together with Helmut Teichner, Dr. Richard Landauer becomes one of the managing directors of the Hirsch department store (Hermann Tietz successor).

Dr. Richard Landauer was born in München in 1892, he later became a publisher (founded "Delphin-Verlag" in 2011), this publishing house is not identical with the children's and non-fiction publishing house "Delphin Verlag based in Küln.

In 1922, he married Edith Landauer, née Hirsch (daughter of Cilly and Hirsch (daughter of Cilly and Adolf Hirsch); children: Eva-Maria, born on December 26, 1922 in Munich; Stefan Klaus Robert on January 9, 1925 in Munich; Robert Felix on February 18, 1927 in Munich.