I want to know the answer to the following question:
In the 15th century, the ruler of which port embraced Islam?
All the background I'm provided with is that "The ruler of the region's most important port, Malacca Sultanate, embraced Islam in the 15th century, heralding a period of accelerated conversion of Islam throughout the region as Islam provided a positive force among the ruling and trading classes.". Is that enough to answer the question?