<Tr> <Th> Relatives </Th> <Td> See Astor family </Td> </Tr> <P> John Jacob "Jack" Astor IV (July 13, 1864--April 15, 1912) was an American businessman, real estate builder, investor, inventor, writer, lieutenant colonel in the Spanish--American War, and a prominent member of the Astor family . </P> <P> Astor died in the sinking of the RMS Titanic during the early hours of April 15, 1912 . Astor was the richest passenger aboard the RMS Titanic and was thought to be among the richest people in the world at that time, with a net worth of nearly $87 million when he died (equivalent to $2.21 billion in 2017). </P> <P> John Jacob Astor IV was born on July 13, 1864 at his parents' country estate Ferncliff in Rhinebeck, New York . He was the youngest of five children and only son of businessman, collector, and race horse breeder / owner William Backhouse Astor, Jr. and socialite Caroline Webster "Lina" Schermerhorn . His four elder sisters were Emily (1854--1881), Helen (1855--1893), Charlotte (1858--1920), and Caroline ("Carrie") (1861--1948). He was a great - grandson of fur - trader John Jacob Astor and Sarah Cox Todd (1761--1834), whose fortune made the Astor family one of the wealthiest in the United States . Astor's paternal grandfather William Backhouse Astor, Sr. was a prominent real estate businessman . Through his paternal grandmother Margaret Alida Rebecca Armstrong (1800--1872), Astor was also a great - grandson of Senator John Armstrong, Jr. and Alida Livingston (1761--1822) of the Livingston family . His maternal grandparents were Abraham Schermerhorn, a wealthy merchant, and socialite Helen Van Courtlandt White . He was also a nephew of financer / philanthropist John Jacob Astor III and grandnephew of occasional poet John Jacob Astor, Jr. (1791--1869). His sister Helen's husband was diplomat James Roosevelt "Rosey" Roosevelt, half - brother of President Franklin Delano Roosevelt of the Roosevelt family . Another sister, Carrie, a noted philanthropist, was the wife of Marshall Orme Wilson (1860--1926), brother of banker Richard Thornton Wilson, Jr. and socialite Grace Graham Wilson . Astor was also a first cousin of William Waldorf Astor, 1st Viscount Astor </P>

Which famed multimillionaire died in the sinking of the titanic
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