There is evidence that members of the St Thomas Christian community observed Brahmin customs in the Middle Ages, such as the wearing of the sacred thread and having a kudumi. The medieval historian Pius Malekandathil believes these were customs adopted and privileges won during the beginning of the Brahmin dominance of medieval Kerala. He argues that the Syrian Christians in Kerala, integrated with Persian Christian migrant merchants, in the 9th century to become a powerful trading community and were granted the privileges by the local rulers to promote revenue generation and to undermine Buddhist and Jain traders who rivaled the Brahmins for religious and political hegemony in Kerala at the time.