The Holy Roman Empire

HRE's territories move regularly. This is not to say its borders change or its people move to different lands, the people and borders stay put but the lands themselves move. Some generations ago the horde of orcs raged westward through Germania. Though the Dutch are largest humans you’ll meet, the Netherlands’ army was not sufficient to push back the Horde, so they came up with a strange solution, separating their land from the Continent.

The Netherlands became an island, sailing along the coast of Europa, it is said to travel from Aegyptus to the North of Ruthenia. This island has another name than the Netherlands, the Holy Roman Empire.

And indeed, although it contains only a small part of the mighty HRE, the Netherlands is ruled by the heir of the last Kaiser – Prince Maximilian I, who would have been the 30th Kaiser after Charlemagne. He lives to this day (often those of Charlemagne’s direct line are long-lived), but he is rumoured to be frail, having aged poorly compared to previous Emperors.

The Netherlands has no reliable allies, holding steadfast alone against threats from European nations and the nations outside of Europa.

Geography
The geography of the country is to its advantage. Its army is small compared to other nations, and could be easily conquered. Unfortunately, because it travels around bordering every country - no army can hold it. When the vikings invade, the army is slaughtered by the time HRE hits Spain. Ditto for the Romans. It is a suicide mission to invade, you throw away a huge chunk of your army and leave them stranded for months as they're assailed by every other nation.

The Netherlands is also useful as a floating cargo ship and trading hub for other nations. It serves such a useful purpose, that maybe there is a treaty...