Deed 31 Mar 1688: "Wait Winthrop and Mary Browne his wife acknowledge by deed to have received of William Browne and Benjamin Browne executors of the father William Browne of Salem ... in right of the said Mary (Browne) Winthrop in full of her portion in the estate of her said late fathers William Brown Esqr deceased".
↑ This birth date 16 Jan 1656 comes from Savage, and appears to not be found in the records. Following Savage's usual conventions, this would mean 16 Jan 1655/56, but the baptism argues it should be treated as 1656/57. There are lots of papers concerning the Winthrop family, and one of those could easily account for the information, but the fact that Source:Anderson, Robert Charles. Great Migration: Immigrants to New England, 1634-1635, p. 1:444, (and others), list only the baptism, suggest this might not be the case.