Two technological and stylistic developments are noticeable from the twelfth century.
1. Arcuate style of architecture: The weight of the superstructure above the doors and windows was sometimes carried by arches. The roofs too used this principle and was converted into vaults and domes. This architectural firm is called ‘arcuate’.
2. Use of Limestone Cement: Limestone cement was increasingly in the construction of heavy and large structures. This was very high-quality cement, which, when mixed with stone chips hardened into concrete. This made the construction of large structures easier and faster. Arches, domes, and limestone mortar were used extensively in buildings after 1190 A.D.
