knowen relation

cannonkuo

Senior Member
Mandarin
It is possible that they were sighted before 1592, when the captain of the English ship Desire, John Davis, reported ‘certaine Isles never before discovered by any knowen relation lying fiftie leagues or better from the shoare East and northerly from The Streights’(straights of Magellan),...

(Sovereignty and the Falklands crisis, p.405)

What does knowen relation mean in the context?
 
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