An important development of martial arts of the Malay world is also attributed to the foreign influence. The infusion of foreign elements were not only obtained through wars and conquests, but also through trade and diplomacy. The growth in trade relations brought in foreign influence throughout the early primordial Austronesian ancient states, most importantly in cultural traits including the combative arts. The influence from both Chinese and Indian martial arts can be observed from the use of weapons such as the Indian mace and the Chinese sword. During this period, formalised combat arts were believed to have been practiced in the Champa, Malay peninsula and Sumatra. From the 7th century, the martial arts were further developed under Srivijaya. The Riau Archipelago is particularly noted in its role in the development of Malay martial arts. Its people Orang Laut also called Orang Selat are stereotyped as sea pirates, but historically played major roles in the times of Srivijaya and later sultanates of Melaka, and Johor. The fighting styles developed in this area are described by different writers as a crude prototype of Malay martial arts and one of the progenitors of modern Malay Silat.