Louis II of Hungary
The Ottoman Sultan, Suleiman the Magnificent, inflicted a crushing defeat on the Hungarian army in the Battle of Mohács on 29 August 1526. For Louis II of Hungary died in the battlefield, John Zápolya and Ferdinand of Habsburg laid claim to Hungary. Both claimants were elected kings before the end of the year. The Székelys supported John. After he made an alliance with the Ottomans, the sultan instructed Petru Rareș, Voivode of Moldavia, to invade Transylvania through Székely Land to fight against Ferdinand's local supporters in 1529.