Question: The county where Benjamin Van Keuren House Ruin is located named after what?
Context: Ulster County is a county located in the U.S. state of New York.  As of the 2010 census, the population was 182,493.  The county seat is Kingston.  The county is named after the Irish province of Ulster. Westbrookville is a hamlet in the town of Deerpark in Orange County, New York, United States, along US 209.  Westbrookville was named for Dirck Van Keuren Westbrook, an early settler.  Fort Westbrook, dating back to the American Revolution, is extant.  The 1900-1930 US Census lists it as part of Mamakating in Sullivan County, New York.  Situated between Port Jervis and Wurtsboro, it is close to the borders of Pennsylvania and New Jersey.  It is located within the Port Jervis City School district.  It contains many small businesses and Westbrookville Cemetery. The United States Navy's Bureau of Ships (BuShips) was established by Congress on 20 June 1940, by a law which consolidated the functions of the Bureau of Construction and Repair (BuC&R) and the Bureau of Engineering (BuEng).  The new bureau was to be headed by a chief and deputy-chief, one selected from the Engineering Corps (Marine Engineer) and the other from the Construction Corps (Naval Architect).  The chief of the former Bureau of Engineering, Rear Admiral Samuel M. "Mike" Robinson, was named BuShips' first chief, while the former chief of the Bureau of Construction & Repair, Rear Admiral Alexander H. Van Keuren, was named as BuShips' first Deputy-Chief.  The bureau's responsibilities included supervising the design, construction, conversion, procurement, maintenance, and repair of ships and other craft for the Navy; managing shipyards, repair facilities, laboratories, and shore stations; developing specifications for fuels and lubricants; and conducting salvage operations. Louis Nelson Van Keuren, born in Wurtsborough, New York on April 17, 1850, was the thirty-first Adjutant General of the State of Connecticut.  Van Keuren worked as a clerk in a book store in Bridgeport, Connecticut.  Before Van Keuren was 20 years old he became a Cashier and Head Accountant in Pacific Iron Works, Bridgeport.  He was also a secretary and treasurer for seven years for Bridgeport Gas Light Company.  Keuren for 10 years was a general manager of the banking house of T.L. Watson & Co of Bridgeport.  Van Keuren was president of the board of Appointment and Taxation of Bridgeport.  In 1899 he was offered the position of secretary and treasurer by The Colonial Trust Company. Belle Grove is a historic home and farm located near Delaplane, Fauquier County, Virginia.  The manor house was built about 1812, and is a 2 1/2-story, five bay, brick and stuccoed stone house in the Federal style.  It has a 1 1/2-story, three bay summer kitchen, built about 1850, and connected to the main house by a hyphen.  Also on the property are the contributing meat house (c. 1812); the barn (c. 1830); a chicken house (c. 1900); a cattle shed (c. 1940); a loafing shed (c. 1940); machine shed (c. 1940); a four-foot square, stone foundation (c. 1812); stone spring house ruin (c. 1812); the Edmonds-Settle-Chappelear Cemetery (1826-1940); an eight-by-twelve-foot stone foundation (c. 1900); a tenant house ruin (c. 1900); a stone well at the manor house (c. 1812); and a loading chute (c. 1940). Waveland is a historic plantation house and farm located near Marshall, Fauquier County, Virginia.  The mansion was built about 1835, and is a two-story, three bay by five bay, brick dwelling in the Greek Revival style.  It has a front gable roof and sits on an English basement.  A six-bay-wide, two bay-deep rear addition designed by noted English architect Edmund George Lind (1829–1909) was added in 1859, creating a "T"-plan dwelling.  Also on the property are the contributing meat house (c. 1835), stuccoed frame farmhouse (c. 1860), cistern (c. 1835), stone spring house ruin (c. 1835), and stone slave quarters ruin (c. 1835). The Benjamin Van Keuren House Ruin is located at the corner of Bruyn Turnpike and Benjamin van Keuren Drive in the western portion of the Town of Shawangunk, in Ulster County, New York, United States.  It was the site of the house built in 1745 by Van Keuren and his wife Sarah, early settlers of the area.  He would later be elected town supervisor four times and serve in the 4th Regiment of the Ulster County Militia during the Revolutionary War. Pleasant Grove is a historic home and farm complex and national historic district located near Halifax, Halifax County, Virginia.  The district includes 17 contributing buildings, 2 contributing sites, and 2 contributing structures on three farm complexes.  They are the Main House Complex, Owen Tenant House Complex, and Ferrell Tenant House Complex.  The main house was built in 1888-1890, and is a two-story Victorian style dwelling.  Associated with it are the contributing smokehouse (c. 1940), pump house (c. 1940), watering trough (c. 1940), cow barn (c. 1940), granary (c. 1890), two corncribs (c. 1930), three tobacco barns (c. 1890), and a hog pen (c. 1930).  The Owen Tenant House was built about 1900 and associated with it are a workshop (c. 1940), pumphouse (c. 1940), hog pen (c. 1940), and chicken house (c. 1940).  The Ferrell Tenant House was built about 1940, and associated with it is a log corncrib (c. 1930).  Also on the property are the ruins of the Blackstock Tenant House and a second tenant house ruin. Van Keurens is a hamlet in the town of Poughkeepsie, Dutchess County, New York.  It was established by Matheus Van Keuren in the eighteenth century. C.P. Jones House and Law Office, also known as the Jones-McCoy House, Almond-Strickler House, and James Bell House, is a historic home and law office located at Monterey, Highland County, Virginia.  The original section of the house dates to about 1850.  Originally the house was a two-story, five-bay, side-gabled, four-room log building on a stone foundation.  Several rooms and porches were added between the middle of the 19th century and the beginning of the 20th century and has a Folk Victorian style.  The law office was built about 1873, and is a one-story, front gable, frame building.  Also on the property are the contributing two-story, side-gabled garage/smoke house/woodshed, a one-story, front-gabled apple shed/cellar, a one-story brick spring house ruin.  It was the home of American soldier and politician Charles Pinckney Jones (1845-1914).
Answer: the Irish province of Ulster