See Dorman, "Adventurers of Purse and Person" sections on Croshaw and West. Vol Iv., p. 490, John West "married by 4 Nov. 1664 Unity Croshaw." Dorman concludes that the mother of the Blackwell children was a different woman. I created a profie for Unity, but the managers of Ursula have not detached her so Unity can be connected..
