Isaac Post was born February 26, 1798, in
Westbury, New York, to Edmund and Catherine (Willetts) Post, members of the Religious Society of Friends, also known as
Quakers. Amy Kirby Post was born December 20, 1802, in
Jericho, New York, among the eight children of Joseph and Mary (Seaman) Kirby, who were also Quakers. Commitment to humanitarian reform was characteristic of Quakers and foundational to the Posts' later work as abolitionists and women's-rights activists. Around 1821, Isaac married Amy's elder sister Hannah. In 1823 they moved to the village of
Scipio in
Cayuga County, New York, and established a farm where Amy soon came to live with them. In 1827 Hannah fell ill and died, and Amy became nursemaid to her sister's two children. Also in 1827,
Elias Hicks, a relative of the Kirbys, charged that the Religious Society of Friends had lost its way, initiating a split of the "Hicksites", including Isaac Post, from their more orthodox brethren. When in 1829 Amy Kirby married Isaac Post, criticism for having taken a "Hicksite husband" led to her withdrawal from the Jericho Meeting to which she had belonged since birth. In addition to her niece and nephew, Amy's maternal responsibilities came to include four more children she had with Isaac: Jacob (1830), Joseph (1834), Matilda (1840), and Willet (1847). The couple moved to Rochester in 1836. ==Abolitionists==