Multiple choice Which of the following happened as a result of the collapse of the Carolingian empire? The Ottoman Turks invaded Constantinople. The population of Europe increased dramatically. A new socio-political system known as feudalism developed. A Viking became the ruler of the Holy Roman Empire. Reveal answer Fill a bubble to check yourself C Correct answer Explanation The collapse of central authority after the Carolingian Empire led to local instability, prompting people to seek protection from local lords, which evolved into the feudal system.