Conversation so far:
What conflict did he have with the Ottoman Empire?
The defeat of Hungary at the Battle of Mohacs in 1526 "sent a wave of terror over Europe." The Muslim advance in Central Europe was halted.
Why did it send a wave of terror over Europe?
The regular Ottoman fleet came to dominate the Eastern Mediterranean after its victories at Preveza in 1538 and Djerba in 1560.
Did he have other conflicts with the empire?
in 1547, Charles signed a humiliating treaty with the Ottomans to gain himself some respite from the huge expenses of their war.

Question: What did the humiliating treaty state?
Self-contained rewrite: What did the humiliating treaty signed by Charles V in 1547 state?