Islam spread gradually in Indonesia from the 12th century onwards, and especially during the 14th and 15th century. Introduction of Islam was peaceful. The advent of Islam did not lead to the introduction of a new building tradition, but saw the appropriation of existing architectural forms, which were reinterpreted to suit Muslim requirements. Existing architectural features in Indonesia such as the candi bentar gate, paduraksa (normally marks entrance to the most sacred precincts), and the sacred pyramidal roof was used for Islamic architecture. For centuries, Indonesian mosques lacked domes or minarets, both considered a Middle Eastern origin. Indonesian original mosques feature multi-layered pyramidal roofs and no minaret. Prayer are called by striking a prayer's drum known as beduk. The minaret of the Menara Kudus Mosque is a great example of Indonesian architecture. Indonesian mosque architecture also features strong influence from the Middle Eastern architecture styles.