Chapter III. -- KURFURST FRIEDRICH II. 

The First Friedrich's successor was a younger son, Friedrich II.; who lasted till 1471, above thirty years; and proved likewise a notable manager and governor. Very capable to assert himself, and his just rights, in this world. He was but Twenty-seven at his accession; but the Berlin Burghers, attempting to take some liberties with him, found he was old enough. He got the name IRONTEETH. Friedrich FERRATIS DENTIBUS, from his decisive ways then and afterwards. He had his share of brabbling with intricate litigant neighbors; quarrels now and then not to be settled without strokes. His worst war was with Pommern,--just claims disputed there, and much confused bickering, sieging and harassing in consequence: of which quarrel we must speak anon. It was he who first built the conspicuous Schloss or Palace at Berlin, having got the ground for it (same ground still covered by the actual fine Edifice, which is a second edition of Friedrich's) from the repentant Burghers; and took up his chief residence there. [1442-1431 (Nicolari, i. 81).] 

But his principal achievement in Brandenburg History is his recovery of the Province called the Neumark to that Electorate. In the thriftless Sigismund times, the Neumark had been pledged, had been sold; Teutsch Ritterdom, to whose dominions it lay contiguous, had purchased it with money down. The Teutsch Ritters were fallen moneyless enough since then; they offered to pledge the Neumark to Friedrich, who accepted, and advanced the sum: after a while the Teutsch Ritters, for a small farther sum, agreed to sell Neumark. [Michaelis, i. 301.] Into which Transaction, with its dates and circumstances, let us cast one glance, for our behoof afterwards. The Teutsch Ritters were an opulent domineering Body in Sigismund's early time; but they are now come well down in Friedrich II.'s! And are coming ever lower. Sinking steadily, or with desperate attempts to rise, which only increase the speed downwards, ever since that fatal Tannenberg Business, 15th July, 1410. Here is the sad progress of their descent to the bottom; divided into three stages or periods:-- 
What was the date?
15th July, 1410