1335 - 1400 (65 years)
| Duke of Yorkshire Walter Grimston | |
| B: | 1413 |
| Grimston (near Aldbrough), Yorkshire, England | |
| D: | 1496 |
| Grimston (near Aldbrough), Yorkshire, England | |
| Lady of East Riding Yorkshire Lady Elizabeth Portyngton | |
| B: | 1418 |
| Portington, Yorkshire, England | |
| M: | 1439 |
| Garton, Yorkshire, England | |
| D: | 1486 |
| Grimston (near Aldbrough), Yorkshire, England | |
| Thomas Grimston, II | |
| B: | 1385 |
| Grimston (near Aldbrough), Yorkshire, England | |
| D: | 5 Jun 1462 |
| Gloucestershire, England | |
| Alice Flynton | |
| B: | 1389 |
| Yorkshire, England | |
| M: | 1412 |
| Grimston (near Aldbrough), Yorkshire, England | |
| D: | 1418 |
| Yorkshire, England | |
| Thomas Grimston, I | |
| B: | 1353 |
| Grimston (near Aldbrough), Yorkshire, England | |
| D: | Aft 1385 |
| England | |
| Dionysia Sutton | |
| B: | 1367 |
| Reading, Berkshire, England | |
| M: | England |
| D: | 1429 |
| England | |
| Armatrude de Rysam | |
| B: | 1335 |
| Suffolk, England | |
| D: | 1400 |
| Yorkshire, England | |
| William de Grimston | |
| B: | 1333 |
| Grimston (near Aldbrough), Yorkshire, England | |
| D: | 1400 |
| England | |
We make every effort to document our research. There is a lot of information that I do not have, and I know there are mistakes in this tree. My feelings will not be hurt if you give me corrections or additional information, especially if you can provide sources for the information.
