der Petersburger
Petersburger
A male resident of the city of Saint Petersburg in Russia.
Der berühmte Schriftsteller war ein gebürtiger Petersburger.
The famous writer was a native Petersburger.

Petersburger
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Petersburger
A male resident of the city of Saint Petersburg in Russia.
Der berühmte Schriftsteller war ein gebürtiger Petersburger.
The famous writer was a native Petersburger.

When 'Petersburger' is used as an adjective to describe origin, it is not declined. It always keeps the ending '-er'.
Wir besuchten eine Ausstellung über die Petersburger Avantgarde.
We visited an exhibition about the Petersburg avant-garde.
Names for male residents of cities are often formed in German by adding the ending '-er' to the city name. The word is derived directly from the city '(Sankt) Petersburg' ((Saint) Petersburg).
Er ist Hamburger, sie ist Berlinerin und ich bin Petersburger.
He is from Hamburg, she is a Berliner, and I am a Petersburger.
The word family includes 'die Petersburgerin' for a female resident and the plural form 'die Petersburger' for several people.
Meine neue Kollegin ist eine gebürtige Petersburgerin.
My new colleague is a native Petersburger.