Title: John W. Tyler
Content:  He was married and had a son.
Title: John Tyrrell (musicologist)
Content:  John Tyrrell (17 August 1942 – 4 October 2018) was a British musicologist. He published several books on Leoš Janáček, including an authoritative and largely definitive two-volume biography.
Title: John Alexander Tyler
Content: Jürgen Just: John Alexander Tyler (1848–1883), US-Präsidentensohn, Freiberger Montane und Karlsruher Bavare. Einst und Jetzt, Jahrbuch des Vereins für corpsstudentische Geschichtsforschung 65 (2020), S. 161–168 [in German]. ISBN: 978-3-87707-182-3. Jürgen Just: John Alexander Tyler (1848–1883), US-Präsidentensohn, Freiberger Montane und Karlsruher Bavare. Einst und Jetzt, Jahrbuch des Vereins für corpsstudentische Geschichtsforschung 65 (2020), S. 161–168 [in German]. ISBN: 978-3-87707-182-3. 
Title: John W. Tyler
Content:  Tyler was knighted in 1888. Margaret Villiers, Countess of Jersey, recollected in her memoirs the time she stayed with Sir John Tyler, superintendent of the jail at Agra, and his "friend" Abdul Karim who was on leave from London. Tyler provided her family with carpets for their home at Osterley. In 1890 he was promoted to Inspector general of jails for the North-Western Provinces, and retired in 1896.
Title: John Tyler (doctor)
Content:  John Tyler (29 June 1763 – 15 October 1841) was an American ophthalmologist. He is believed to be one of the first doctors in the United States to perform cataract surgery.
Title: John Tyler Sr.
Content:  John Tyler Sr. (February 28, 1747 – January 6, 1813) was an American planter, 15th Governor of Virginia, United States District Judge of the United States District Court for the District of Virginia and the father of President John Tyler.
Title: John James Tayler
Content:  John James Tayler (1797–1869) was an English Unitarian Minister.
Title: John W. Tyler
Content:  John Tyler was born around 1840 in India, and was fluent in Hindustani. He received his basic education at Doveton College in Calcutta (now Kolkata), before gaining admission to Calcutta Medical College to study medicine. He travelled to England in 1861 and acquired licentiates of the Society of Apothecaries, Royal Colleges of Surgeons, and the Royal College of Physicians of Edinburgh. He received his MD from the University of St. Andrews in 1862 and in 1870 was elected a fellow of the Royal College of Physicians of Edinburgh.
Title: John Tayler
Content:  John Tayler (July 4, 1742 – March 19, 1829) was a merchant and politician. He served nine years as Lieutenant Governor of New York, four months as the fifth Governor of New York, and also in both houses of the New York State Legislature.
Title: John W. Tyler
Content:  In 1863, Tyler joined the Uncovenanted Indian Medical Service in the North-Western Provinces, later known as the United Provinces of Agra and Oudh, serving initially as a civil surgeon. He was transferred to Manipuri in 1866 and in 1873 became superintendent of the prison at Meerut. Three years later, he became superintendent of Agra Central Jail, a position he held for 14 years, during which time he developed the prison as an important manufacturing centre for high quality carpets. He donated one such Persian carpet to British civil servant and scholar Frederic Growse for the Catholic church at Mathura, built in the 1870s.

Question: what was john tyler?
Answer: President of the United States.