Tondo's regional prominence further culminated during its trade and alliance with Brunei's Sultan Bolkiah around 1500. When the Spanish first arrived in Tondo in 1570 and defeated the local rulers in the Manila Bay area in 1591, Tondo came under the administration of Manila (a Spanish fort built on the remains of Kota Seludong), ending its existence as an independent state. This Tondo community continues to exist today as a district of the city of Manila.