Interactions between the followers of Hinduism and Islam began very soon after the advent of the latter in the Arabian Peninsula, in the 7th century, mainly through trade across and around the Indian Ocean. Historically, these interactions formed contrasting patterns in northern and southern India. In the north of India there is a history of conquest and a legacy of Hindus living under the domination of Muslim rulers stretching back to the Delhi Sultanate of the 13th century. The relations between Hindus and Muslims have historically been largely peaceful in Kerala and Tamil Nadu(except during Mappilla rebellion, Coimbatore bomb blasts and Marad riots).