When Adolf hitler seize power in Germany prior to world war ll, what title did he bestow on himself

The title you may be looking for is "Führer und Reichskanzler" (leader and chancellor of the Reich).

Adolf Hitler became the Führer of Germany in 1934 after President Paul von Hindenburg's passing. Hitler demolished the remnants of Hindenburg's democratic government to make way for his Third Reich. The Fuhrer assured his people that the Third Reich would last for a thousand years, but Nazi Germany collapsed just 11 years later.