Julia Ruth Stevens, his sole surviving daughter, calls him Daddy. Odd as it is to hear a nonagenarian refer to a man 60 years gone as Daddy, it is also a tender reminder of the limits of hyperbole, how grandiose honorifics obscure the messy, telling details of an interior life.

To others he is a brand, an archetype, a lodestar. His shape is ingrained in our DNA. His name recognition, 96 percent, is higher than any living athlete. (His Q score, a measure of how much the people who know him like him, is 32 percent compared to 13 percent for today’s average major leaguer.) And yet, as well-known as he is, the most essential biographical fact of his life, one that demands revisiting what we thought we knew, one that Julia assumed everybody knew, remained unknown.