made an inroad upon the Podolian lands and plundered Kiev, while on the other side Kazimir was believed to have incited the Order to hostilities against Moskva.[99] Ivan’s forces, however, overawed the Teutons, and in another direction Kazimir’s designs were frustrated; a counter matrimonial alliance, between Mikhail of Tver and a granddaughter of the King of Poland, was nipped in the bud by the Grand Prince’s vigilance, and soon afterwards the Tverskie kniaz, detected in an intrigue with Kazimir, was forced to fly from Ivan’s vengeance. [Sidenote: 1485] The little principality, which had been for centuries a thorn in the side of Moskva, was swallowed up in the Grand Prince’s dominions, and Kazimir had the mortification of seeing his enemy grow stronger instead of weaker as a result of this diplomatic skirmishing. If the Polish King counted on wearying Ivan into some rash or negligent act of open hostility or wanton enterprise he knew not his man. The Moskovite never undertook a task greater than his forces were able to accomplish, or attempted to hold more than he could with safety manage. Hence his resources were never exhausted, and the long period of pent hostility was turned on his part to solid advantage. [Sidenote: 1487] The small appanages of Rostov and Yaroslavl shared the fate of Tver and Novgorod, Viatka was reduced to submission, Perm and the silver-yielding region of the Petchora were added to the sovereignty, and Kazan, long a scourge to the Volga Russians, fell into the power of the Grand Prince. Ivan set a vassal Khan on the throne of this new dependency, reserving for himself the title of Prince of Bulgaria. A new title, indeed, was becoming necessary to describe the august being who was emerging from the cocoon state of a Prince of Moskva, and Ivan henceforth begins to style himself Tzar in his foreign correspondence.[100]