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Inheritance

Frederick was twenty-eight years old when his father died and he ascended to the throne of Prussia. Frederick William I had left him with a highly militarised state. Prussia was the twelfth largest country in Europe in terms of population, but its army was the fourth largest, after France, Russia and Austria. Prussia had one soldier for every 28 citizens, whereas Britain only had one for every 310, and the military absorbed 86% of Prussia's state budget. The Prussian infantry trained by Frederick William I were, at the time of Frederick's accession, arguably unrivalled in discipline and firepower. By 1770, Frederick had doubled the size of the huge army he had inherited. The situation is summed up in a widely translated and quoted aphorism attributed to Mirabeau, who asserted in 1786 that " La Prusse n'est pas un pays qui a une armée, c'est une armée qui a un pays " ("Prussia was not a state in possession of an army, but an army in possession of a state"). Using the resources his frugal father had cultivated, Frederick was eventually able to establish Prussia as the fifth and smallest European great power.

When Frederick ascended the throne as the third "King in Prussia" in 1740, his realm consisted of scattered territories, including Cleves, Mark, and Ravensberg in the west of the Holy Roman Empire; Brandenburg, Hither Pomerania, and Farther Pomerania in the east of the Empire; and the Kingdom of Prussia, the former Duchy of Prussia, outside of the Empire bordering the Polish–Lithuanian Commonwealth. He was titled King in Prussia because his kingdom included only part of historic Prussia; he was to declare himself King of Prussia after the First Partition of Poland in 1772.