See also
| Husband: | Ralph de MONTHERMER (c. 1260-1325) | |
| Wife: | Joan of ACRE (1272-1307) | |
| Children: | Mary de MONTHERMER (1297- ) | |
| Name: | Ralph de MONTHERMER | |
| Sex: | Male | |
| Father: | - | |
| Mother: | - | |
| Birth | c. 1260 | |
| Occupation | Earl of Gloucester and Earl of Hertford, 1st Baron Monthermer | |
| Death | 5 Apr 1325 (age 64-65) | Salisbury, Wiltshire, England |
| Name: | Joan of ACRE | |
| Sex: | Female | |
| Father: | Edward 'Longshanks' I PLANTAGENET (1239-1307) | |
| Mother: | Margaret of FRANCE ( - ) | |
| Birth | Apr 1272 | |
| Death | 7 Apr 1307 (age 34-35) | |
| Name: | Mary de MONTHERMER | |
| Sex: | Female | |
| Spouse: | Duncan MACDUFF (c. 1290-1333) | |
| Birth | Oct 1297 | |
5 children (one stillborn).
Ralph was a knight in the household of Joan of Acre, daughter of King Edward I of England. After the death of Joan's husband Gilbert de Clare, 6th Earl of Hertford, in 1295, Ralph and Joan fell in love. They were secretly married in January 1297. King Edward was enraged by his daughter's marriage to a commoner. He had Monthermer thrown in prison, and Joan had to plead for the release of her husband. According to the St. Albans chronicler, she told her father, "No one sees anything wrong if a great earl marries a poor and lowly woman. Why should there be anything wrong if a countess marries a young and promising man?" With the intervention of Antony Bek, Bishop of Durham, the King relented, and released Monthermer from prison in August 1297. The king even allowed Monthermer to hold the titles of Earl of Gloucester and Earl of Hertford, during Joan's lifetime. The titles had been taken from Joan's six-year-old son Gilbert de Clare, 7th Earl of Hertford, and were returned to the boy upon Joan's death (1307).
Ralph then held no title, for two years, until he was summoned to parliament and made 1st Baron Monthermer (1309).
Her first marriage is to Gilbert.