Ferdinand Knab was a German painter active in the latter half of the 19th century.
He trained as an architect, but after working in the field for two years, he left to devote himself to architectural painting. Aside from that, I can find little information and only a few image resources.
Knab frequently focused on romanticized visions of classical buildings or ruins in landscape, often framed with dramatic sunsets.










Link: Ferdinand Knab on Wikimedia Commons
The Athenaeum Wikipedia (DE), Google Translate version here
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MutualArt
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The Athenaeum Wikipedia (DE), Google Translate version here
Invaluable
MutualArt
Artnet