Isaac Smith Tallmadge was the eldest of nine children born to
Nathaniel P. Tallmadge (1795–1864) and his first wife, Abigail Lewis ('''' Smith; 1804–1857). Nathaniel Tallmadge served two terms as United States senator from New York, and was then appointed the 3rd governor of the
Wisconsin Territory. He was also one of the first significant landowners in what is now
Fond du Lac County, Wisconsin, and his former estate is the site of
Rienzi Cemetery. The Tallmadge family were descendants of the Thomas Talmadge, who emigrated from England to the
Massachusetts Bay Colony in 1631. Isaac Tallmadge married Cornelia Ruggles in December 1847. They had seven children together, but at least two died in infancy. They were married for 35 years before his death in 1882. ==References==