Rule, Britannia!

[Cyclops]

The Danes were ultimately unsuccesful, it was more like a series of raids and settlement. And i didnt count the romans since there wasnt an English state yet. That leaves two?

The Danes took half of "England" and made it their own with their settlements, law and place names. They affected the language we call English very deeply, so it no longer resembles the language spoken in the Angle.

Military forces from the continent took control of England under the Danes (including Harald Bluetooth-ugh, what an image) the Normans (French speaking Danes) Plantagenets (plain French) Tudors (Welsh mercenary of the French) Oranges (Dutch mercenary of a rebel faction) and Hanoverians (German mercenaries of the same faction).

The Whig version of history is a tired joke, it supports a triumphalist view of history (similar to the American "manifest destiny" model) that recent events have proved false.