In December 1641 Jeremias van Vliet left Ayuthaya and sailed to Batavia. He stopped en route at Singora in February 1642 and presented Sulaiman with a letter of introduction from the Phra Khlang (known by the Dutch as the Berckelangh), the Siamese official responsible for foreign affairs. Sulaiman's response sheds light on his attitude towards suzerainty:
