Final answer:
Suleiman I, also known as 'the Magnificent,' was the ruler who almost conquered Europe during his reign as the Sultan of the Ottoman Empire from 1520 to 1566.
Step-by-step explanation:
The ruler who almost conquered Europe was Suleiman I, also known as 'the Magnificent.' During his reign as the Sultan of the Ottoman Empire from 1520 to 1566, Suleiman expanded the empire's territory into Europe. He captured Belgrade in 1521, Hungary in 1526, and nearly captured Vienna in 1529 and again in 1683. His military dominance and expansion into Europe earned him the title 'the Magnificent.'