In May 1813 he was sent as stadtholder to Norway to promote the loyalty of the Northmen to the dynasty, which had been very rudely shaken by the disastrous results of Frederick VI.'s adhesion to the falling fortunes of Napoleon.
By the victories of Pichegru the stadtholder and all his family were, however, compelled to leave Holland and seek refuge in England, where the palace of Hampton Court was set apart for their use.
The treaty included a secret article, which the states-general refused to entertain, but which De Witt succeeded in inducing the states of Holland to accept, by which the provinces of Holland pledged themselves not to elect a stadtholder or a captain-general of the union.
The authority conferred upon Orange as stadtholder by the provinces of Holland and Zeeland was thus ratified, but that astute statesman had no confidence that Philip intended to observe the treaty any longer than it suited his convenience.
The brothers de Witt, in consequence of their fresh offer to treat at any price, were assassinated; the broken dykes of Muiden arrested the victorious march of Cond and Turenne; while the popular and military party, directed by the stadtholder William of Orange, took the upper hand and preached resistance to the death.
Among the many interesting monuments is the imposing tomb of the stadtholder Count Engelbert of Nassau and his wife.
Flushing, the port of Zeeland, which commanded the approach to Antwerp; and the inhabitants were compelled to take the oath to the prince of Orange, as stadtholder of the king.
On leaving college, he entered the royal aulic chancellery, and in 1832 was appointed secretary of the royal stadtholder at Buda.
The stadtholder summoned a meeting of the states of Holland and Zeeland to Delft, and on the 25th of April an act of federation between the two provinces was executed.
Both as stadtholder of the Duchies in 1526, and as viceroy of Norway in 1529, he displayed considerable administrative ability, though here too his religious intolerance greatly provoked the Catholic party.