 Tomé Pires, in his report “Summa Oriental (1513–1515)”, wrote about his journey to the Sunda kingdom.Diogo do Couto also wrote that the Sunda kingdom is thriving and abundant; it lies between Java and Sumatra, having between it and the latter the Straits of Sunda.Besides that, the Portuguese made a peace treaty with the Sunda kingdom in 1522 AD.