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In page Dordrecht:

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The city was formed along the Thure river, in the midst of peat marshes. This river was a branch of the river Dubbel, which is part of the massive Rhine–Meuse–Scheldt delta complex, near the current Bagijnhof. Around 1120 reference to Dordrecht was made by a remark that count Dirk IV of Holland was murdered in 1049 near "Thuredrech".[citation needed]