Adverbial clause or adjective clause

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TimSanta
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Joined: Fri Nov 22, 2019 6:35 pm
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Adverbial clause or adjective clause

Post by TimSanta » Fri Nov 22, 2019 6:36 pm

In the 13th century, when Groningen was an important trade centre, its inhabitants built a city wall to underline its authority.

Is "when Groningen was an important trade centre" an adjective clause that modifies the 13th century or is it an adverbial clause that expresses time. I would guess that it is an adjective clause that modifies an adverbial noun, but I am not entirely sure.

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