For the existence of a trading town a functional exchange of different kind of goods, people, and a good interaction of the cultures is necessary. This principle was valid at the time of the Phoenicians as well as for the present and can be seen on many levels within a location. The influences can be recognized even after centuries by the different architectural styles, the development of urban planning and the infrastructure. This Master Thesis deals with the impact of the different cultures on the urban development of Essaouira. It shall be analysed how the urban development structure of a location will be influenced, if European and Islamic architecture and their different moral concepts interact. First a detailed overview of the development of the Islam and the traditional construction methods of the Maghreb states shall be given. Afterwards, the influences of the respective architectural styles on the urban development, the residential building and the general design of Essaouiras shall be examined in detail and compared with the building traditions of Morocco and Europe. The focus is on the requirements of Muslim behavioral rules and their significant influence on urban development. The architecture of the medina of Essaouira shall be analyzed and the different levels be shown by using photographs and old plans. First, the overall urban situation is analyzed, followed by the level of the residential streets and, finally, the private courtyard houses. This combination of citizens from different countries of origin makes the port city particularly interesting compared to other old cities of Morocco. The design scheme of the room chamber or the courtyard house is, for example, a characteristic feature of Islamic architecture and urban development. But this type of house is also common in other parts of the world. The Islamic courtyard house derives its meaning and layout from the rules of conduct of the Muslim faith. Due to this reason in many parts of the medina the life takes mainly place within one's own house and behind closed walls, while the social life takes place along the main street axes and market streets. Essaouira is therefore an example of a melting pot of different citizens, which at that time corresponded to the cityscape of our present day.