Catherine de Grandison was born circa 1304 in Ashperton, Herefordshire, England, United Kingdom to William de Grandison, 1st Baron Grandison (-c1335) and Sibyl de Tregoz (-1334) and died 23 November 1349 Bisham, Berkshire, England, United Kingdom of unspecified causes. She married William de Montacute, 1st Earl of Salisbury (1301-1344) .
Children
| Name | Birth | Death | Joined with |
| Elizabeth de Montacute (-1359) | |||
| William de Montacute, 2nd Earl of Salisbury (1328-1397) | 20 June 1328 | 3 June 1397 | Joan of Kent (1328-1385) Elizabeth de Mohun (1343-1415) |
| John de Montacute, 1st Baron Montacute (c1330-c1390) | 1330 England | 1390 England | Margaret Monthermer (1329-1394) |
| Anne de Montagu (c1330-) | 1330 | John de Grey (bef1322-bef1351) | |
| Philippa de Montacute (1332-1382) | 1332 | 1381 | Roger Mortimer, 2nd Earl of March (1328-1360) |
| Sibyl de Montacute | |||
| Alice de Montacute | |||
Footnotes (including sources)
| ‡ General |
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