
I visited St Mary's in Melton Mowbray recently and saw this tomb and I have been researching Sir Hamon since although there is very little information about him but plenty of geneology and information about Lord Mowbray as mentioned in the stone above the tomb.
The information I found was Hamon Belers de Aubigny was brother to Roger Lord Mowbray born around 1120 died 1160. All the Lord Mowbrays since then did not have a brother called Hamon and he is the only member of the Mowbray Aubigny to be buried at Melton.
So my conclusions would lead me to say this is Hamon Belers de Aubigny from 12th Century.
Bellire :
from Bellieres, near Alencon. "In the south aisle of the church of Melton Mowbray, under a round arch, is a cross-legged knight in a round helmet of mail with a band, his shield on his left arm, bearing Gules a lion rampant sable; his sword is under it; his belt is plated, and there is a dog at his feet. Over him is inscribed, in modern characters,
"This is the Lord Hamon,
Brother to the Lord Mowbray."
This latter was the son of Nigel de Albini, Roger, who, by command of Henry I., took the name of Mowbray."—Nichols Leicestershire. The tomb of Hamon's grandson, Rafe (date 1170) is also there, and is "erroneously ascribed by Mr. Le Neve to Adam de Vilers." I can find no mention of a third brother of Roger, Lord Mowbray's, in their pedigree, but it seems certain that Hamon de Beler received his Leicestershire lands by his grant, and bore his arms in different tinctures, though most probably only as those of his suzerain. Their ancient seat, Kirkby Belers, retains their name