Battle of Hastings Participants
This list is taken from the plaque in the church at Dives-sur-Mer,Normandy, France, here William the Conqueror and his knights saidmass before setting sail to invade England in 1066. It lists all the knights who took part in the invasion." ---- So we are told.

The truth of the story is that only a handful of men can be reliably attested to have been at Hastings with Guillaume, Duc de Normandie on that momentous occasion, which is not to imply that his force was very small.

George Edward Cokayne's "The Complete Peerage," [revised by others] vol. XII, postscript to Appendix L (regarding the 1066 Battle of Hastings), "Companions of the Conqueror," pp. 47-48, has the following short list:

1. Robert de Beaumont, later first Earl of Leicester.
2. Eustace, Count of Boulogne.
3. William, afterwards third Count of Evreux.
4. Geoffrey of Mortagne, afterwards Count of Perche.
5. William Fitz Osbern, afterwards first Earl of Hereford.
6. Aimeri, Vicomte of Thouars.
7. Hugh de Montfort, seigneur of Montfort-sur-Risle.
8. Walter Giffard, seigneur of Longueville.
9. Ralph de Toeni, seigneur of Conches.
10. Hugh de Grandmesil, seigneur de Grandmesnil.
11. William de Warenne, afterwards first Earl of Surrey.
12. William Malet, seigneur of Graville.
13. Eudes, Bishop of Bayeux, afterwards Earl of Kent.
14. Turstin Fitz Rou.
15. Engenulf de Laigle, seigneur of Laigle.

(# 1-12 are recorded by William of Poitiers, # 13 portrayed in
the battle scene on the Bayeux Tapestry, # 14-15 named by Orderic
Vitalis.)

There are reportedly five more who were certainly in the Duke's
army and were probably at the battle:

16. Geoffrey de Mowbray, Bishop of Coutances.
17. Robert, Count of Mortain, afterwards first Earl of Cornwall.
18. Wadard, believed to be a follower of the Bishop of Bayeux
19. Vital, believed to be a follower of the Bishop of Bayeux.
20. Goubert d'Auffay, seigneur of Auffay.

(# 16 is named by William of Poitiers, # 17-19 are portrayed
in the Bayeux Tapestry, # 20 is said by Orderic Vitalis to have taken
part in the English War before William became King of England.)