Longman Dictionary of Contemporary English homepage

known

2 adjective
     
known2 W3
1 [only before noun] used about something that people know about or have discovered:
a study of all the known facts
her last known address
Apart from vaccines, there is no known way to protect against meningitis.
2 [only before noun] a known criminal, drug dealer etc is someone who people know to be regularly involved in criminal activities or to do other things that are disapproved of:
He was found with several other known sex offenders.
a known liar
3

be known for something

to be famous or known about by a lot of people because of something:
He's known for his good looks.
The region is known for its fine wines
4

well-known/little-known/lesser-known

used when saying how famous someone is:
works by lesser-known French artists

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