Known for his ability both to sing and play an instrument, Louis Armstrong was a rare kind of jazz virtuouso.
Known of his ability both to sing and play an instrument, Louis Armstrong was a rare kind of jazz virtuouso.
Known for his ability both to sing and play an instrument, Louis Armstrong was a rare kind of jazz virtuouso.
Known of his ability both to sing and play an instrument, Louis Armstrong was a rare kind of jazz virtuouso.
The verb "known" can take a few prepositions: "for", "as", or "by". Here, "known for" indicates a quality by which someone is famous or recognized. The construction "known of" is always wrong.