Medieval architecture is a term used to represent various forms of architecture

Architecture

Architecture is both the process and product of planning, designing and construction. Architectural works, in the material form of buildings, are often perceived as cultural and political symbols and as works of art...

 common in Medieval Europe

Middle Ages

The Middle Ages is a periodization of European history from the 5th century to the 15th century. The Middle Ages follows the fall of the Western Roman Empire in 476 and precedes the Early Modern Era. It is the middle period of a three-period division of Western history: Classic, Medieval and Modern...

.
The Latin cross plan, common in medieval ecclesiastical architecture, takes the Roman basilica

Basilica

The Latin word basilica , was originally used to describe a Roman public building, usually located in the forum of a Roman town. Public basilicas began to appear in Hellenistic cities in the 2nd century BC.The term was also applied to buildings used for religious purposes...

 as its primary model with subsequent developments. It consists of a nave

Nave

In Romanesque and Gothic Christian abbey, cathedral basilica and church architecture, the nave is the central approach to the high altar, the main body of the church. "Nave" was probably suggested by the keel shape of its vaulting...

, transept

Transept

For the periodical go to The Transept.A transept is a transverse section, of any building, which lies across the main body of the building. In Christian churches, a transept is an area set crosswise to the nave in a cruciform building in Romanesque and Gothic Christian church architecture...

s, and the altar

Altar

An altar is any structure upon which offerings such as sacrifices are made for religious purposes. Altars are usually found at shrines, and they can be located in temples, churches and other places of worship...

 stands at the east end (see Cathedral diagram

Cathedral diagram

In Western ecclesiastical architecture, a cathedral diagram is a floor plan showing the sections of walls and piers, giving an idea of the profiles of their columns and ribbing. Light double lines in perimeter walls indicate glazed windows. Dashed lines show the ribs of the vaulting overhead...

). Also, cathedral

Cathedral

A cathedral is a Christian church that contains the seat of a bishop...

s influenced or commissioned by Justinian

Justinian I

Justinian I ; , ; 483– 13 or 14 November 565), commonly known as Justinian the Great, was Byzantine Emperor from 527 to 565. During his reign, Justinian sought to revive the Empire's greatness and reconquer the lost western half of the classical Roman Empire.One of the most important figures of...

 employed the Byzantine style

Byzantine architecture

Byzantine architecture is the architecture of the Byzantine Empire. The empire gradually emerged as a distinct artistic and cultural entity from what is today referred to as the Roman Empire after AD 330, when the Roman Emperor Constantine moved the capital of the Roman Empire east from Rome to...

 of domes and a Greek cross (resembling a plus sign), with the altar located in the sanctuary on the east side of the church.

Surviving examples of medieval secular architecture mainly served for defense.