Final answer:
Spain was the most notable region in Europe that was part of the Muslim Empire, with the city of Cordoba symbolizing the height of Islamic culture on the continent.
Step-by-step explanation:
The Muslim Empire included various territories in Europe during different periods of history. One significant European region that came under Muslim rule is Spain. Iberia, as it was known historically, along with parts of Sicily in Italy, was conquered by Arab forces. The arrival of Islam in Spain or Al-Andalus took place in the year 711 C.E. with the invasion by an Arab-Berber alliance known as the Moors. The city of Cordoba in Spain became a magnificent metropolis, symbolizing the golden age of Islamic culture in Europe. Islam's influence in Spain lasted until 1492 when the Catholic monarchs completed the Reconquista, reconquering the last Muslim-held territories. While the Islamic rule did extend into Sicily during the Abbasid period, Spain was the most extensive territory in Europe to come under the Muslim rule.