LYNCHBURG, Tenn. — Every year, about 275,000 people tour the Jack Daniel’s distillery here, and as they stroll through its brick buildings nestled in a tree-shaded hollow, they hear a story like this: Sometime in the 1850s, when Daniel was a boy, he went to work for a preacher, grocer and distiller named Dan Call. The preacher was a busy man, and when he saw promise in young Jack, he taught him how to run his whiskey still — and the rest is history.

This year is the 150th anniversary of Jack Daniel’s, and the distillery, home to one of the world’s best-selling whiskeys, is using the occasion to tell a different, more complicated tale. Daniel, the company now says, didn’t learn distilling from Dan Call, but from a man named Nearis Green — one of Call’s slaves.

This version of the story was never a secret, but it is one that the distillery has only recently begun to embrace, tentatively, in some of its tours, and in a social media and marketing campaign this summer.

“It’s taken something like the anniversary for us to start to talk about ourselves,” said Nelson Eddy, Jack Daniel’s in-house historian.