Die voorvader van die Barrys was een van William the Conqueror se vriende, en het hom gehelp om Engeland in te val in 1066. So beskryf Lawrence H. Parker, AB dit:

Even before the Norman Conquest of England, many Normans had taken up residence in England, just across the Channel. The mother of King Edward the Confessor was the daughter of Duke Richard of Normandy, and Edward himself received his education at the Norman Court. Becoming King of England in 1042 AD, he had appointed many of his Norman friends to positions of trust. As early as 1051 AD, his cousin William, Duke of Normandy, had visited England and obtained from the too complaisant Edward (who was childless) a promise that he should succeed to the English Crown. But upon Edwards death in 1065, the English Witan elected Harold, a Saxon nobleman, to the vacant kingship. Thereupon, Duke William commanded his feudal followers to gather their retainers for an invasion of Britain.
Among the Norman Barons who responded to this summons came our DE BARRI ancestor, whose surname was derived (as were so many *place names* used in those days to distinguish individuals) from La Barre in Normandy, according to the conclusions of Sir John Wolfe Barry, KCB, FRS, who has given this mater long and critical study.
Crossing the English Channel in 1066 AD, the Normans attacked the Saxons near the seaside town of Hastings. In the long and furious battle which ensued, the Barry battle-cry, *Boutez en avant* – press forward – was heard again and again as the DE BARRI foces plied their swords against the Saxon yeomen. The battle did not end until Harold, the Saxon King, was struck down by a Norman arrow. His followers fled, leaving the Normans masters of the field.