Famous as one of the first converts to and missionaries of the Latter Day Saint movement, Young is perhaps best known as the older brother of LDS Church president Brigham Young.
A native of Hopkinton, Massachusetts, he grew up in a Protestant family and was a Methodist minister for a time. In 1832, after being introduced to The Book of Mormon by a missionary named Samuel Smith, Young joined his brothers John, Joseph, and Brigham in a Mormon baptism ceremony.
He settled in Salt Lake City and also led Mormon missions in England.
He had nine wives: Clarissa Hamilton, Lucy Cowdery, Sarah Hollister, Phebe Clark, Maria James, Elizabeth Rea, Harriet Little, Constantia Langdo, and Lavina Clark.
Following the death of Latter Day Saints movement founder Joseph Smith, Phineas endorsed his brother Brigham Young's leadership of the movement.