William Thatcher, the lead character in the 2001 film A Knight's Tale played by Heath Ledger claimed to be Sir Ulrich von Liechtenstein from Gelderland so as to appear to be of noble birth and thus qualify to participate in jousting.
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William intervened in favor of Edward in the catastrophic war of succession between his brothers-in-law Reinald and Edward for control of the Duchy of Guelders.