[1] In 1478, Cirebon fell completely under the control of locally established foreign Muslim traders with the help and protection of the Demak Sultanate.

The Demak sultan, Trenggana, was hostile to any Portuguese settlements in Java and decided to prevent them at all costs, so he had his commander, Fatahillah, lead 2,000 men to conquer Banten.

The Sundanese king stationed most of his forces in his palace, and a small part of them were sent to defend Sunda Kelapa.

[3][4] By this time, the Portuguese had sent a fleet of five[5] or six[6] ships led by Francisco de Sa and Duarte Coelho.

They held a meeting and decided that they weren't strong enough to attack, so they sailed back to Malacca, destroying the Sundaese king's hopes.

[9] The Portuguese decided to put their treaty on hold and five years later after the fall of Sunda Kelapa, were openly trading with rulers of Banten.