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.
They had a son named Guy I de.
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Children
Guy I de Guy I de , of Laugharne, Sir/Briene
Guy I de was born about 1225 in Laugharne, Carmarthenshire, Wales. He died in 1307.
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