Prior to the onset of Islamisation, the Pallava script, Nagari, and old Sumatran scripts were used in writing the Malay language. This is evidenced from the discovery of several stone inscriptions in Old Malay, notably the Kedukan Bukit inscription and Talang Tuo inscription. The spread of Islam in Southeast Asia and the subsequent introduction of Arabic writing system began with the arrival of Muslim merchants in the region since the seventh century. Among the oldest archaeological artefacts inscribed with Arabic script are; a tombstone of Syeikh Rukunuddin dated 48 AH (668/669 CE) in Barus, Sumatra; a tombstone dated 290 AH (910 CE) on the mausoleum of Syeikh Abdul Qadir Ibn Husin Syah Alam located in Alor Setar, Kedah; a tombstone found in Pekan, Pahang dated 419 AH (1026 CE); a tombstone discovered in Phan Rang, Vietnam dated 431 AH (1039 CE); a tombstone dated 440 AH (1048 CE) found in Bandar Seri Begawan, Brunei; and a tombstone of Fatimah Binti Maimun Bin Hibat Allah found in Gresik, East Java dated 475 AH (1082 CE). Islam was spread from the coasts to the interior of the island and generally in a top-down process in which rulers were converted and then introduced more or less orthodox versions of Islam to their peoples. The conversion of King Phra Ong Mahawangsa of Kedah in 1136 and King Merah Silu of Samudra Pasai in 1267 were among the earliest examples.