Certain adjectives change their meanings depending if they appear before or after the noun.
The meaning of adjectives that can be placed before or after a noun in French
Here's the case of ancien:
After the noun it means ancient / old
Remember that generally adjectives appear after the noun, but some very common adjectives go before (See Adjectives usually go AFTER nouns in French (Position of Adjectives) and Position of French Adjectives - Short and common adjectives that go BEFORE nouns)
See also:
Propre = own/clean (French Adjectives that change meaning according to position)
Cher= dear/expensive (French Adjectives that change meaning according to position)
Certain = specific / sure in French (adjectives that change meaning according to position)
Dernier = final/previous (French Adjectives that change meaning according to position)
Vrai = real/true (French Adjectives that change meaning according to position)
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