Hungarian citizenship by descent, but a bit far back.

Under old Hungarian law, emigrants lost their Hungarian citizenship after 10 years' absence from Hungary, unless certain exceptions applied. After the lapse of 100 years, it would be pretty difficult to prove that any of these exceptions applied to your GGGPs.

Yes, I know what you're thinking, but under the old law, minor children also lost their Hungarian citizenship when their father lost his Hungarian citizenship. My best guess is that you'd be wasting your time trying to demonstrate that you were at birth a Hungarian citizen by descent from ancestors who left Hungary 110 years ago.

So let's just assume your ancestors somehow lost their Hungarian citizenship, and that you'll be relying on Simplified Naturalization.

Please read the long threads here on SN: there's a lot information in there.

But basically, you'll need to start with the birth certificate of an ancestor born in pre-1920 Hungarian territory, and then build a trail of marriage and birth certificates demonstrating your descent from that ancestor. Only one ancestor is necessary.

I assume your GGGPs were born before 1895, so their birth records would be church records.

Of course under SN you'll also have to demonstrate a reasonable command of Hungarian, and all your documents will need recognized Hungarian translations, if not already in Hungarian.