In 1568 Hungary was partitioned into three with Royal Hungary being reduced to allow for the autonomous principality of Transylvania, which was also under the control of the Turks. Ferdinand I was Holy Roman emperor from 1558 to his death in 1564 when his eldest son became the Holy Roman emperor Maximilian II. He fought an unsuccessful campaign against the Turks in Hungary, not so much with a view to taking control of parts of the country they controlled but more to combat the threat they posed to his empire.
Sa 1568 Hungary ay partitioned sa tatlong sa Royal Hungary ay nabawasan na pahintulutan para sa nagsasarili principality ng Transylvania, na kung saan ay din sa ilalim ng control ng Turks. Ferdinand I ay Banal na Roman emperador mula sa 1,558 sa kanyang kamatayan sa 1564 kapag diko kanyang anak na lalaki ay naging ang Banal na Roman emperador Maximilian II. He fought ng isang nabigo kampanya laban sa mga Turks sa Hungary, hindi kaya marami sa isang view sa pagkuha ng bahagi ng bansa nila kontrolado ngunit mas sa labanan ang pananakot nila posed sa kanyang imperyo.