It would not be profitable in this place to follow at length the story of his frequent wars with Muscovy and with the Tartar hordes of the Crimea, and of his diplomatic struggles with the Turks, the Empire, Hungary, and Sweden.

On the whole he succeeded not only in holding his own, but in augmenting his power.

He it was who finally settled the vexatious question of the relationship of his crown to the Teutonic Order, which, since 1466, had held Prussia as a fief, though a constantly rebellious and troublesome one.

The election of Albert of Brandenburg as Grand Master of the Order threatened more serious trouble, [Sidenote: 1511] but a satisfactory solution of the problem was found when Albert embraced the Lutheran faith and secularized Prussia as an hereditary duchy, at the same time swearing allegiance to Sigismund as his suzerain.

[Sidenote: 1525] Many years later Sigismund's son conquered and annexed another domain of the Teutonic order further north, namely Livonia.