Assertion: monarchy's king | /r/HasProperty | established on 16 march
Facets:
value: after the napoleonic wars
type: TEMPORAL
Source sentences:
text: His son, Prince William V, was the last stadtholder of the republic, whose own son, King William I, became the first king of the United Kingdom of the Netherlands, which was established on 16 March 1815 after the Napoleonic Wars.