The Post-Roman West saw major changes after the fall of Rome in 476 CE. New kingdoms emerged, including the Franks under Clovis I and Charlemagne's empire. The Byzantine Empire continued in the East, while Islam rose in the 7th century. Feudalism and manorialism reshaped society and economics. The Catholic Church gained power, leading to the Crusades from 1095-1291 CE. These holy wars aimed to retake Jerusalem, sparking cultural exchange but deepening religious divides between Christians and Muslims.