allegendly
According to a legendary retelling (of doubtful origin). As alleged in a likely heavily embellished story.
During the battle of Iwo Jima, his grandfather allegendly charged two enemy machine gun nests and single-handedly destroyed them using his flame-thrower.
Allegendly
This is your legal disclaimer when telling of something one has heard spoken about as a rumor which through time becomes a myth.
Remember when Richard Gere had a big weekend with a declawed gerbil? Allegendly!?