Agnes' father had just been created
Earl of March, and was thus able to look for more powerful spouses for his children. In a brilliant set of marriages, Agnes was therefore married to
Laurence Hastings, 1st Earl of Pembroke, a ward of her father's, while her sister Beatrice was married to
Edward of Norfolk.
Edward III and
Queen Isabella attended the wedding at Hereford; dates of this event vary by historian, and it has been speculated that it took place in late May or early June 1328, or in 1329. Agnes and Laurence had one surviving son,
John Hastings, 2nd Earl of Pembroke, who was born in August 1347. Laurence died a year later. ==Second marriage==