Guy III de Brienne 
He had a biological son named Guy IV Baron de.
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Children
Guy IV Baron de Brienne , of Walwyn's, Sir
Guy IV Baron de was born about 1202 in Walwyn's Castle, Haverfordwest, Pembrokeshire, Wales. He died on June 1st, 1252 in Walwyn's Castle, Haverfordwest, Pembrokeshire, Wales.
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