William (Sir) IV de WASHINGTON & Katherine UNKNOWN 
They had a son named William (Sir) V.
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Personal Details
William (Sir) IV de WASHINGTON
William (Sir) IV de was born about 1310 in Durham, or North lancashire, England. He died in 1367.
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Children
William (Sir) V WASHINGTON
William (Sir) V was born about 1340 in Washington, Durham , England. He died in 1399.