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How did Maximilian I strengthen Habsburg claims to Hungary and Bohemia in 1515?

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Stone ruins of Habsburg Castle, also known as Habichtsburg, stand on a hill above green vineyards in Aargau canton, Switzerland, with a flag flying atop the tower. — House of Habsburg Ruins of the castle of Habsburg, or Habichtsburg (“Hawk's Castle”), built 1020, the original seat of the house of Habsburg, Aargau canton, Switzerland.

In 1515, Emperor Maximilian I strengthened the Habsburg claims to Hungary and Bohemia by arranging advantageous dynastic marriages between members of the Habsburg family and the Hungarian royal house. These arrangements were formalized through the Vienna accords of 1515, which provided for the Habsburg succession in both Bohemia and Hungary should the ruling Jagiellonian dynasty die out without male heirs.12

This diplomatic strategy built upon earlier efforts, such as the Treaty of Pressburg in 1491, and was further supported by Maximilian’s broader foreign policy, which included making overtures to Russia to pressure the Jagiellonian powers into accepting his expansionist plans. These agreements ultimately paved the way for the Habsburgs to acquire these territories following the death of King Louis II at the Battle of Mohács in 1526.3124