Researchers had long known of the marriage of Richard Warren to Elizabeth Walker on 14 April 1610 at Great Amwell, Hertford. Since we know the Mayflower passenger had a wife named Elizabeth, and a first child born about 1610, this was a promising record. But no children were found for this couple in the parish registers, and no further evidence beyond the names and timing, until the will of Augustine Walker was discovered. In the will of Augustine Walker, dated April 1613, he mentions "my daughter Elizabeth Warren wife of Richard Warren", and "her three children Mary, Ann and Sarah." We know that the Mayflower passenger's first three children were named Mary, Ann, and Sarah (in that birth order).

Edward Davies, "The Marriage of Richard Warren of the Mayflower", The American Genealogist 78(April 2003):81-86.