A very significant clue has been find on Isaac Henthorn and Mabel Wildman as witnesses in the marriage records of Isaac Jackson and Ann Evans in County Meath Ireland.
We find that Isaac Jackson and Ann Evans came to America about 1725 and are found in the same area (Chester Co., PA and Frederick Co., MD) as the Jacksons that intermarried with the Henthorns after coming to America. These families were associated with Thomas Cresap to some extent.
2. ISAAC, son of (1) Anthony Jackson, born in the year 1665. He married Ann, daughter of Rowland Evans,(Euans) of the County of Wicklow, and removed to reside at or near Ballytore.(+) Their marriage was accomplished at Oldcastle, 2mo. 29, 1696, (O.S.) and a record of their certificate is still preserved on the Minutes of Carlow (ancient name Cathorlagh) Monthly Meeting, a copy whereof, as taken from the original is here appended:
"These are to certify the truth to all people, that Isaac Jackson, of Oldcastle, in the county of Meath, and Ann Evans, daughter of Rowland Evans, of Balliloing,(Ballitore) in the county of Wicklow, having intentions of marriage with each other, according to God's ordinance, did lay it before the particular men and women's meeting at Drumiam, (or Drummond) in the county of Cavan,upon the 29th of the 11mo. 1695; where nothing appearing against it, they laid it before the Province meeting at Ann Webb's, in county of Ardmagh, upon the 1st day of the 12mo. following and year aforesaid; who, taking their said intentions into consideration, desired them to wait a time, in which time several Friends were appointed to make enquiry in the places where their residence was and of late hath been--whether the man was clear from all other women and whether the woman was clear from all other men; and whether their parents and relatives were satisfled with their said intentions--and presenting the second time their said intentions of marriage before the Province meeting at Richard Boyes's, in the parish of Ballinderry, and county of Antrim, upon the 14th day of the First month, 1696, and account being brought to the said men's meeting of all things being found clear, and their intentions of marriage being several times published in the meetings to which they belonged, and nothing appearing against it, at a meeting of the
People of God held at Oldcastle, on the 29th day of the Second month, 1696, where they being contracted, the said Isaac Jackson publicly and solemnly declared as followeth:--In the fear and dread of the great God, and before this assembly of people, I take Ann Evans to be my wife till death separate.
And Ann Evans also declared, in the fear of God and before this people, I take Isaac Jackson to be my husband and give myself to be his wife till death shall separate--which being performed according to the practice of the people of God recorded in the Scriptures of truth, it is to be recorded in a Book kept for that purpose, to which he subscribes his name Isaac Jackson, and she likewise subscribes her name Ann Jackson, to which we be witnesses.
The Minutes(*) of Carlow Monthly Meeting, Ireland, supply the following record of Isaac and Ann Jackson's children:
REBECCA, born at Oldcastle, 1mo. 25, 1697.
THOMAS,"""11mo. 9, 1698.
ISAAC,"""7mo. 1, 1701, died 12mo. 15, 1701.
ALICE,"""8mo. 29, 1703.
WILLIAM, born at Clonerany, County of Wexford, 2mo. 24, 1705.
JAMES, born at Ballytore, County of Kildare, 2mo. 10, 1708.
ISAAC,""""""5mo. 13, 1710;
died 8mo. 13, 1710.
JOHN, born at Ballytore, County of Kildare, 10mo. 16, 1712
ISAAC, """"""1mo. 13, 1715.
NOTE: William Jackson of Philadelphia, during a visit to Ireland in 1870, had access to the old Records of Carlow Monthly Meeting, kept in the archives belonging to Friends, in Dublin,
Soon after their arrival in America and settlement at Londongrove, Chester County, Pennsylvania, Isaac Jackson and family became members of New Garden Monthly Meeting, as appears from the following Minute taken from the Records of that Meeting:
"10mo. 9, 1725, Isaac Jackson produced a certificate to this Meeting from a Monthly Meeting held at Carlow, in the nation of Ireland, in behalf of himself and wife, which was satisfactory, and accepted."
Isaac died in the autumn of 1750, in the eighty-sixth year of his age; but the exact time of his wife's death does not appear to have been recorded. There is however a record that it occurred about six or seven years after their arrival in this country, which would fix the time in 1731 or 1732.
SOURCE: PROCEEDINGS OF THE Sesqui-Centennial Gathering OF THE DESCENDANTS OF ISAAC AND ANN JACKSON, AT HARMONY GROVE, CHESTER CO., PA. Eighth Month, Twenty-fifth, 1875. TOGETHER WITH THE FAMILY GENEALOGY.