This flag, which is a combination of the red cross of St. George on a white background (corresponding to the flag of England) and a golden splendor cross is commonly attributed to William the Conqueror.
The then Duke of Normandy is said to have carried this flag in 1066 when the victorious Battle of Hastings, which is known to initiated the conquest of England and William secured the crown.
Today this flag is the official emblem of Guernsey, Channel Islands.
The flag of William the Conqueror is about 93 cm high and 150 cm wide. To fasten two metal eyelets are attached.