A note: I have in my records that the last name is "Croshaw". Thought that might help.
Ursula Unity (Croshaw) Crenshaw (daughter of Joseph Croshaw and Mary Bromfield) was born 1626 in Brewton Parish, York, Virginia, and died Aft. October 1693 in York, Virginia. Her name has been found also as Unity. She married first Robert Blackwell on Bet. 1645 - 1646 in Virginia, son of Robert Blackwell. She married second, Colonel John West in 1654.
Robert Blackwell's wife is reported variously as Daughter #3 or Daughter #4 of Joseph Croshaw. Emily Calloway Stillman's research is heavily documented and she identifies the Croshaw daughter that married Robert Blackwell as a daughter by his first wife but does not name her.
The following is from "The Blackwells of Blackwell's Neck" by June Banks Evans: The marriage of a Croshaw daughter to Robert Blackwell has been questioned. However, the Blackwell land was located next to some of the New Kent County land of John West, who owned the large tract in the fork between the Mattaponi and Pamunkey Rivers at the head of the York River - the West Plantation. (PB3:93, 291). West's son John, who was eighteen years old when his father died in 1659, later married Unity Croshaw, daughter of Major Croshaw of York County (Harris, Old New Kent County:567) It is not unreasonable to suggest that John West married the widow of Robert Blackwell (who died before November 1664) and became guardian for her young children, which would account for the deed of gift to Croshaw's Blackwell grandsons. After the death of Croshaw, his daughter Unity and her husband John West eventually held title to all of his estate lands."
Emily Calloway Stillman makes a valid observation that Unity would have been listed as Unity Blackwell at the time that she married John West had she previously been married to Robert Blackwell.
More About Ursula Unity (Croshaw) Crenshaw and Robert Blackwell: Marriage: Bet. 1645 - 1646, Virginia. Children of Ursula Unity (Croshaw) Crenshaw and Robert Blackwell are:
[Unity Croshaw] is perhaps most notable as the reportedly shrewish wife of Colonel John West, son of Governor John West, who divorced him for adultery when he left her to live with Cockacoeske who was the queen of the Pamunkey Indians and a cousin of Pocahontas.(According to Wikipedia)
Robert (ancestry unknown) b.1610 Eng died 1664 York VA. came to Virginia circa 1635; On 1644 in York VA he married Unity Ursula Crosahw 1608 VA after 1657 VA). 
Unity died after 30 October 1693, when she relinquished dower in "Poplar Neck".
I don't know the name of Robert Blackwell's wife, but she was the daughter of Major Joseph Crowshaw. Robert Blackwell was born in England, but I don't know about his wife. It says that Robert came to Virginia in 1645 and it says he also got married 1645. Wanda Richards
On 29 Jun 2011 Ted Williams wrote:
one of the main figures of the early Jamestown Settlement. She was the grandchild of Raleigh Croshaw, one of the founders of Jamestown. She was the daughter-in-law of Colonial Virginia Governor John West of the Colony and Dominion of Virginia (now part of the United States). But she is perhaps most notable as the reportedly shrewish wife of Colonel John West, son of Governor John West, who divorced him for adultery when he left her to live with Cockacoeske who was the queen of the Pamunkey Indians and a cousin of Pocahontas.
Unity Croshaw was born at Bruton Parish, Williamsburg, James City, Virginia. She was christened in 1636 at West Point, King William County, Virginia, and she married Colonel John West there in 1654. The couple had the following children:
Captain Nathaniel West (b. 1655-1724), he was mentioned in records as a Captain in 1662, a Major in 1667, Lt. Colonel in 1673. He commanded the militia of the county. Nathaniel married his second cousin Martha Woodard. Their son-in-law, William Danridge, was Martha Washington's uncle. Unity (Susannah) West (b. 1657), married George Martin. Anne West (b.1660-1708), married Henry Fox. John West III (b. 1666), married Judith Armistead. Captain Thomas West (b. 1670-1714), married Agnes (?).
Unity died on April 20, 1669 in New Kent County Virginia.
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On 4 Nov 2016 at 18:42 GMT Robin Lee wrote:
On 19 Aug 2016 at 23:26 GMT Vicki Norman wrote:
On 19 Aug 2016 at 13:23 GMT Brent Bowen wrote:
I have taken a DNA test (I'm 95% GreatBrit & 5% Trace Region- Ireland & Europe West) and can upload in order to disprove rumor's that Joseph Croshaw's wife and mother of his children was Rachel (Pocahanta's cousin). I read "story" that Unity was caring for a Rachel and it was more than likely her sister, Rachel Graves (1629-1656). I would like the to see the record corrected and the inclusion of Unity's children by Robert Blackwell. John West went to court many times to fight for his stepsons to retain the land and for it to not go to Joseph's last wife and her son. Thank you The sender, Merry Crawford (firstname.lastname@example.org), was not logged-in to WikiTree.
On 23 Nov 2014 at 20:05 GMT Michelle McQueen wrote:
Ursula is 15 degrees from Kevin Bacon, 17 degrees from Cindy Lesure, 14 degrees from Bonnie Thornton and 16 degrees from Queen Elizabeth II Windsor on our single family tree. Login to find your connection.