Elizabeth Durfee (March 11, 1791 - December 16, 1876), Joseph Smith's twelfth wife, gives us yet another case of Joseph marrying a woman who "belonged" to another man. At the time of her marriage to Joseph she was still Jabez Durfee, her third husband following the death of her previous two.
The Durfee's moved to Nauvoo with their ten children (she had had children with both of her previous husbands and Jabez had a few of his own as well) in 1839. She married Joseph Smith in 1842. She was 51 and, like the Patty Sessions, who was also older than Joseph, became a polygamy recruiter. Elizabeth was not a virgin and did not bear Joseph any children. Emma didn't know about this marriage either.
Elizabeth and Jabez separated shortly after Joseph's death. She married again, this time to Cornelius Lott. In addition to finding a fifth husband, she got a sister wife through Cornelius' daughter Melissa, who was also married to Joseph.
Elizabeth never made it out to Utah. Instead she grew tired of the Brighamites and went back to Nauvoo, where she joined Emma and Joseph Smith III in the Reformed LDS Church (Community of Christ).
Marry the prophet! Marry the prophet! Don't disobey!