A while back I posted that if you are somehow descended from Patrick Grehan Senior (1756 -1832) and Judith Grehan (neé Moore), then you are a fourth cousin of Anne Boleyn , and a fifth cousin of Elizabeth 1st. You can find that post here.  I hadn’t taken it any further, so I’m grateful to Nancy Beckley for pushing things back to Edward the First. I picked it up, and pushed it a bit further. It all seems very impressive until you do the maths. 27th great-grandparent means there are another 536 million other great-grandparents who aren’t kings or queens. Still it’s always nice having a saint in the family.

Saint Margaret is Scotland’s only royal saint, and Malcolm is the one in Macbeth. 

27th great grandparents William the Conqueror (1028–1087) and Matilda of Flanders (1031-1083), and also Saint Margaret and the Scottish king Malcolm III. 

26th great grandparents Henry I (1068 – 1135) and Matilda [originally christened Edith] of Scotland (c. 1080 – 1 May 1118),

25th great grandparents Geoffrey V (1113 – 1151) of Anjou and Matilda, (1102 – 1167)

24th great grandparents Henry II ( 1154 -1189) and Eleanor of Aquitaine (1122 -1204)

23rd great grandparents King John (1199-1216) Isabella of Angoulême (1188 – 1246)

22nd great grandparents Henry III (1207-1272)/Eleanor of Provence (1223 – 1291)

21st great grandparents: King Edward I (1239-1307)/Eleanor of Castile (1241 – 1290)

20th great grandparents:  Elizabeth of Rhuddlan (1282-1316)./ Humphrey de Bohun, (1276-1322) 4th Earl of Hereford (second husband)

19th great grandparents:  Lady Eleanor de Bohun (1304-1363)/James Butler (1305-1338), 1st Earl of Ormond

18th great grandparents:  James Butler (1331-1382), 2nd Earl of Ormond/Elizabeth Darcy (1332-1390)

17th  great grandparents: James Butler (1359-1405), 3rd Earl of Ormond/Anne Welles (1360 -1397)

16th  great grandparents:  Richard Butler (1395-1443), Sir Richard Butler of Polestown/ Catherine O’Reilly(1395-1420), Gildas O’Reilly, Lord of East Breifne

15th  great grandparents:  Edmund MacRichard Butler (1420-1464), The MacRichard of Ossory/ Catherine O’Carroll (?-1506)

14th  great grandparents:  Sir James Butler (1438 -1487),/Sabh Kavanagh (1440 -1508), Princess of Leinster, daughter of Donal Reagh Kavanagh MacMurrough, King of Leinster (1396-1476)

13th great grandparents:  Piers Butler (1467-1539), 8th Earl of Ormond/Margaret Fitzgerald (c.1473 -1542)

12th great grandparents:  Thomas Butler (?-1532)/wife not known

11th great grandparents:  Margaret Butler/Rory O’More (?-1556)

10th great grandparents:  Lewis O’More/wife not known

9th great grandparents:  Walter Moore/Alicia Elliott

8th great grandparents:  Patrick Moore/Joan O’Hely

7th great grandparents:  Edmund Moore/Elizabeth Graham

6th great grandparents:  James Moore (?-1741)/Mary Cullen

5th great grandparents:  Edward Moore (?-1787)/Jane Reynolds

4th great grandparents:  Judith Moore (1763-?)/Patrick Grehan (1758-1832)

3rd great grandparents:  Patrick Grehan (1791-1853)/Harriet Lescher (1811-1877)

2nd great grandparents:  Celia Mary Grehan(1838-1901)John Roche O’Bryen1810-1870

1st great grandparents: Ernest A O’Bryen 1865-1919/Gertrude Purssell 1873 -1950