The Peruvian poet and lyricist of Los heraldos negros was not a German national. Neither was the author of Tales of a Long Night.
Bruno Alfred Dblin (10 August 1878  26 June 1957) was a German novelist, essayist, and doctor, best known for his novel "Berlin Alexanderplatz" (1929). 
Csar Abraham Vallejo Mendoza (March 16, 1892  April 15, 1938) was a Peruvian poet, writer, playwright, and journalist. 
Tales of a Long Night (German: "Hamlet oder Die lange Nacht nimmt ein Ende" ) (1956) is the last novel of German author Alfred Dblin. 
"Los heraldos negros" is the title of a collection of poems written by the Peruvian poet Csar Vallejo between the years 1915 and 1918 and published in July 1919. 
