He died in exile in Flanders, though Professor Pim de Boer at the University of Groningen has found serious (though not entirely conclusive) indications that Gijsbrecht - after his exile, with a few followers - founded Pruissisch Holland (now in Poland), not far from Elbing (also now in Poland).
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In 1296 Gerard van Velsen conspired together with Herman van Woerden, Gijsbrecht IV of Amstel, and several others to kidnap Floris V. The count was eventually imrisoned in the Muiderslot.