What second and first empires is the Third Reich supposed to succeed?

The Third Reich was purportedly the successor of The Roman Empire and the German Empire which lasted from 1871 to 1918

It was officially known as Deutsches Reich and later Gro

The First Reich (or 'Empire') was the Holy Roman Empire period of the German Nation begun in A.D. 962 when Otto the Great was crowned in Rome. This Empire, of course, did indeed last - more or less intact - for around a thousand years.
The Second Reich was founded by Otto von Bismarck in 1871 after the defeat of France in the Franco-Prussian War.When the Hohenzollern dynasty collapsed in 1918 with the abdication of Emperor William II, the Second Reich came to its end.
This was followed by the Weimar Republic proclaimed by the Social Democrats or Labour Party at the end of 1918 and which lasted until 1933.
In turn, it was followed by Hitler's Third Reich which he regarded as an empire that would also last for a thousand years. On January 30, 1933, President von Hindenburg appointed Adolf Hitler as Chancellor of Germany. (Hitler had adopted the term 'Third Reich' in the early 1920s after the German writer Arthur Moeller von der Bruck used it as a title for one of his books.)