De or het ridderzate?

The correct Dutch article is:

de ridderzate

Rule Words ending in -te: usually de. See the rule

How to use ridderzate

the ridderzatede ridderzate
this ridderzatedeze ridderzate
that ridderzatedie ridderzate
our ridderzateonze ridderzate
your ridderzatejouw ridderzate
every ridderzateelke ridderzate
which ridderzate?welke ridderzate?
a big ridderzate / the big ridderzateeen grote ridderzate, de grote ridderzate