The William of Orange reference article from the English Wikipedia on 24-Apr-2004
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William of Orange

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William of Orange is the name of several historical people. They are also sometimes known under the Dutch version of the name, Willem.

There are five Stadtholders in the Dutch Republic and three kings in the subsequent Kingdom of the Netherlands.

The House of Orange died out in the direct line, but a sideline (the Stadtholders of Friesland), inherited the title. After the French Revolution the son of Willem V returned to the Netherlands and became: Usually, the name William of Orange means William I of Orange when discussing Dutch, William III of Orange when discussing English history.