The other principalities were eventually absorbed, be it by conquest, purchase or marriage contract: The Yaroslavl in 1463, Rostov was bought in 1474, Tver in 1485, and Vyatka 1489.
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In the Russo-Swedish War (1495–1497) Ivan III unsuccessfully attempted to conquer Viborg from Sweden but this attempt was checked by the Swedish garrison in Viborg Castle led by Lord Knut Posse.
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After the death of his first consort, Maria of Tver (1467), and at the suggestion of Pope Paul II (1469), who hoped thereby to bind Russia to the Holy See, Ivan III wedded Sophia Paleologue (also known under her original Greek and Orthodox name of Zoe), daughter of Thomas Palaeologus, despot of Morea, who claimed the throne of Constantinople as the brother of Constantine XI, the last Byzantine emperor.
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In an effort to reunite the Catholic Church and the Orthodox Church, Pope Paul II arranged during 1472 a marriage between the Catholic daughter of Thomas, Zoe Palaiologina (renamed Sophia), and Grand Prince Ivan III of Russia, with the hope of making Russia a Roman Catholic country.