Some clarification re Richard III DNA Private User and Erica Howton
My purposes in suggesting the above exercise may require less complex analysis than it suggests. First, simply determining that there is no way Jeffrey Ferris could be related to King Edward I would tell us to look somewhere else for Jeffrey's ancestors. The flip side of that might confirm there is a possibility of such a relationship and, therefore, a continued search in the direction of the Ferrers, Earls of Derby, is warranted. A similar analysis with respect to King Edward III might tell us which part of the Ferrers tree to explore. I am not suggesting multi-year test of DNA in a university lab.
Below are the relevant lines of descent as I have them. You can see the sources and/or download the GEDCOM file from http://sites.rootsmagic.com/Ferris-Ferrers/index.php
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King Edward I (1239-1307) to Sir William Ferrers (1332-1371)
King Edward I (1239-1307) &
Eleaner of Castile (1241—1290)
Joan ef Acre (1272-1307) &
Gilbert de Clare (1243—1295)
Elizabeth de Clare (1295—1360) &
Theobold de Verdun (1278—1316)
Isabel de Verdun (1315—1349) &
Henry de Ferrers (1303—1343)
Sir William Ferrers (1332-1371)
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King Edward I (1239-1307) to King Richard III (1452—1485)
King Edward I (1239—1307) &
Eleanor of Castile (1241-1290)
Joan of Acre (1272-1307) &
Gilbert de Clare (1243—1295]
Elizabeth de Clare (1295—1360) &
John de Burgh (1290-1313)
William de Burgh (1312—1333) &
Matilda of Lancaster (1310—1377)
Elizabeth de Burgh (1332-1363) &
Lionel of Antwerp Plantagenet (1338-1368)
Philippa Plantagenet (1355—1382) &
Edmund de Mortimer (1352—1381)
Roger de Mortimer (1374-1398) &
Alianore de Holand (1373-1405)
Anne de Mortimer (1388—1411) &
Richard of York (1375—1415)
Richard Plantagenet (1411-1460)
Cecily Neville (1415—1495)
King Richard III (1452—1485)
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Sir William Ferrers (1332-1371) to Sir John Ferrers (1452-1485)
Sir William Ferrers (1332-1371) &
Margaret de Ufford (1333-1368)
Henry Ferrers (1355-1388) &
Joan De Poynings (1356-1394)
Sir William Ferrers (1372-1445) &
Philippa Clifford (1374-)
Sir Thomas Ferrers (1395-1459) &
Elizabeth Freville (1398-)
Sir Thomas Ferrers (1422-1498) &
Anne Hastings (1438-1479)
Sir John Ferrers (1452-1485)
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King Edward III (1312—1377) to Sir John Ferrers (1452-1485)
King Edward III (1312—1377) &
Philippe d'Avesnes (1311-1369)
Lionel of Antwerp Plantagenet (1338-1368)
Elizabeth de Burgh (1332—1363)
Philippa Plantagenet (1355-1382) &
Edmund de Mortimer (1352-1381)
Elizabeth de Mortimer (1371—1417) &
Thomas de Camoy (1360-1421)
Alice de Camoy (1407-1455) &
Leonard Hastings ((1397-1455)
Anne Hastings (1438-1479) &
Sir Thomas Ferrers (1422—1498)
Sir John Ferrers (1452-1485)