She was born on a bitterly cold December night in 1626 and, in the candlelight, mistakenly declared a boy. On her father's death six years later, she inherited the Swedish throne. She was tutored by Descartes, yet could swear like the roughest soldier. She was painted a lesbian, a prostitute, a hermaphrodite, and an atheist; in that tumultuous age, it is hard to determine which was the most damning label. She was learned but restless, progressive...