De or het haringkoning?

The correct Dutch article is:

de haringkoning

Rule Words ending in -ing: almost always de. See the rule

How to use haringkoning

the haringkoningde haringkoning
this haringkoningdeze haringkoning
that haringkoningdie haringkoning
our haringkoningonze haringkoning
your haringkoningjouw haringkoning
every haringkoningelke haringkoning
which haringkoning?welke haringkoning?
a big haringkoning / the big haringkoningeen grote haringkoning, de grote haringkoning