Medieval architecture was the art of designing and constructing buildings in the Middle Ages. Major styles of the period include pre-Romanesque, Romanesque, and Gothic. The Renaissance marked the end of the medieval period, when architects began to favour classical forms. While most surviving medieval constructions are churches and military fortifications, examples of civic and domestic architecture can be found throughout Europe, including in manor houses, town halls, almshouses, bridges, and residential houses. Guilds were formed by craftsmen during this period to organize their trades. Architects were usually master masons (Magister lathomorum), and were typically responsible for the structural engineering of their buildings, for ensuring that they were stable, unlike in later periods. Source: Wikipedia (en)