The knight fought in a manner which was brave what clause ​

which was brave. is the clause.

and it is the adjective clause identifying the noun knight.

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Answer:

“The knight fought in a manner which was brave” has an adverb clause.

Explanation:  

An adverb clause is a type of dependent clause that serves as an adverb. An adverb clause modifies ‘a verb’, ‘an adjective’ or ‘another adverb’. In the sentence ‘The knight fought in a manner which was brave’ the adverb clause is ‘which was brave’. It is a dependent or subordinate clause that modifies the verb ‘fought’. If the clause was to be replaced with an adverb it would be’, ‘The knight fought bravely.’ Bravely is an ‘adverb of manner’.