John Jacob Astor IV 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, Helen, Charlotte, and Caroline ("Carrie"). He was a great-grandson of fur-trader John Jacob Astor and Sarah Cox Todd, 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
John Jacob Astor IV patented several inventions, including a bicycle brake in 1898, a "vibratory disintegrator" used to produce gas from peat moss, and a pneumatic road-improver, and he helped develop a turbine engine. Like generations of Astors before him, he also made millions in real estate. In 1897, Astor built the Astoria Hotel, "the world's most luxurious hotel", in New York City, adjoining the Waldorf Hotel owned by Astor's cousin and rival, William. The complex became known as the Waldorf-Astoria Hotel. The Waldorf-Astoria would later be the host location to the U.S. inquiries into the sinking of the RMS "Titanic", on which Astor