Trierer
Trier
Refers to the city of Trier; originating from Trier or belonging to Trier. This adjective is indeclinable.
Der Trierer Dom ist die älteste Bischofskirche Deutschlands.
Trier Cathedral is the oldest episcopal church in Germany.

Trier
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Trier
Refers to the city of Trier; originating from Trier or belonging to Trier. This adjective is indeclinable.
Der Trierer Dom ist die älteste Bischofskirche Deutschlands.
Trier Cathedral is the oldest episcopal church in Germany.

Adjectives derived from city names are often formed with the ending '-er'. This rule applies to many German cities, for example 'Hamburger Hafen' (Hamburg harbor) or 'Kölner Dom' (Cologne Cathedral).
Die Hamburger Speicherstadt ist weltberühmt.
Hamburg's Speicherstadt warehouse district is world-famous.
'Trierer' is an indeclinable adjective. This means it never changes its form, no matter what case or gender the noun has. The ending always remains '-er'.
Wir besuchen den Trierer Dom (Akkusativ).
We are visiting Trier Cathedral (accusative).
The adjective 'Trierer' is often used with well-known sights or products from Trier. Typical examples are 'Trierer Porta Nigra' (Trier Porta Nigra), 'Trierer Amphitheater' (Trier Amphitheater), or 'Trierer Wein' (Trier wine).
Die Porta Nigra ist das bekannteste Trierer Wahrzeichen.
The Porta Nigra is Trier's best-known landmark.