itself, represents a more authentic Serbian style, as opposed to the Raška and Vardar styles, which originated under the direct influence of romanesque and Byzantine architecture. The same goes for the frescos, which has developed a new Serbian style which is more intimate, sensitive and effeminate in appearance. During this period, the fortifications architecture developed as part of the two largest fortresses on Serbian soil, including extensive fortified churches. During the first quarter of the 15th century, Prince Stefan Lazarević built the Belgrade Fortress, and in the second quarter Prince Đurađ Branković built Smederevo Fortress. Romanesque and Gothic Besides the three common ecclesiastical schools, in the northern part of what is today Vojvodina province, there are examples of Hungarian romanesque and early gothic architecture as seen at Arača and Bač Fortress. Most of this type of architecture was ether demolished during the many wars between Hungary and the Ottomans, or torn down to make way for structures with more period appropriate styles. Because of these historic outcomes, there are very few preserved examples of non-fortification western European romanesque and gothic architecture in Serbia. These types of styles would reappear in the form of historic revival styles in the modernity period. Orthodox romanesque church design that did not follow Raška school style can be seen with Ružica Church in Belgrade and Church of the Holy Mother of God at Donja Kamenica. Medieval Christian fortifications Most medieval fortification architecture in Serbia followed ether Romanesque, Gothic, Byzantine, or Morava style influences. They were ether constructed on top of existing Roman or Byzantine fortifications, or on newly planned terrain (ether flat or on top of a hill). Surviving examples had all the common castle features depending on the terrain requirements, such as a bailey, keep (including donjon towers), battlements (crenelations, hordings and machicolations), gatehouses, moats, arrowslits, great halls, etc. Most impressive example of medieval fortifications can be seen with Smederevo Fortress, built by Đurađ Branković between 1428 and 1480. It is considered one of the largest fortification in Europe in terms of covered terrain. The monumental complex was built in the Byzantine tradition and modeled after Constantinople Fortress. There are examples of fortified monasteries, such as Manasija (preserved fortified walls) and Ravanica (walls are partially in ruins). With the introduction of Bastion fort designs in the modernity period, medieval fortresses along the banks of the Danube river would be partially or completely demolished to