legendary

adjectives

so celebrated as to having taken on the nature of a legend
"the legendary exploits of the arctic trailblazers"
is similar to
apprehended with certainty
"a known quantity"; "the limits of the known world"; "a musician known throughout the world"; "a known criminal"
celebrated in fable or legend
"the fabled Paul Bunyan and his blue ox"; "legendary exploits of Jesse James"
is derived from