It is likely that, being Persian, Sheikh Ahmad came from Southern Muslim India, as trade links between Golconda's main port, Masulipatnam, and Tenasserim in Siam already existed by the second half of the 16th century. All this, however, remains guesswork due to the lack of sources from Iran.
Sheikh Ahmad is often credited with introducing the Ithna Ashariyyah, or Imami Shi‘ism, to Siam at the beginning of the 17th century, reflecting the growing Islamic influence amidst existing religious dynamics. [6]
Ibn Muhammad Ibrahim did not once, throughout his account (The Ship of Sulayman), refer to Sheikh Ahmad. [7]
Although likely not the founder of the Persian community in Siam, Ahmad is believed to have been the first Chula Ratchamontri (6), or Shaykh'ul Islam, a position offered to him by King Songtham. The Chula Rachamontri was at the same time the leader of the Muslim community, the adviser to the King on Islamic matters, and responsible for settling disputes among non-Chinese foreigners. The office still exists today. (Marcinkowski, 2005)
The Ahmad family line controlled the "Department of Western Maritime Affairs", known in Siam as the "Krom Tha Khwa", from the 17th century onwards. The head of the Krom Tha Khwa sat to the right of the King at court, higher than his colleague in the 'western department', who sat to the left of the Siamese monarch and was regarded as lower in rank. The "Department of Western Maritime Affairs" was one of the four departments of the Phra Khlang, reorganised with the assistance of Sheikh Ahmad and Muhammad Said during the 1610s and employed by the Ayutthaya Kings to maintain Ayutthaya's status as a profitable centre for trade. The three other reformed departments were the "Department of General Administration, Appeals and Records", the "Department of Royal Warehouses" and the "Department of Eastern Maritime Affairs and Crown Junks". [8]
The Krom Tha Khwa was essentially the Kingdom’s means of engaging profitably with the Muslim trade networks throughout Asia. The new structural division grouped all areas of primary concern to Muslim traders into a single department, encompassing all the ports on the northern and eastern rims of the Indian Ocean, as well as the Muslim trading centres in the Indonesian world. The department had various territorial responsibilities, particularly regarding the Siamese Indian Ocean ports on the west coast of the peninsula (Tenasserim, Mergui). The power of the "Department of Western Maritime Affairs", which was larger and more complex than its 'eastern' counterpart, declined towards the late 18th century. (Marcinkowski, 2005)