kochi is also known as Cochin, is a city in the Indian state of Kerala. The city is one of the principal seaports of the country and is located in the district of Ernakulam, about 220 kilometres (137 mi) north of the state capital, Thiruvananthapuram. It has an estimated population of 600,000, with an extended metropolitan population of about 1.5 million, making it the largest urban agglomeration and the second largest city in Kerala after the capital. Since 1102 CE, Kochi was the seat of the Kingdom of Cochin, a princely state which traces its lineage to the Kulasekhara empire. Heralded as the Queen of the Arabian Sea, Kochi was an important spice trading centre on the Arabian Sea coast from the 14th century onwards. Ancient travellers and tradesmen referred to Kochi in their writings, variously alluding to it as Cocym, Cochym, Cochin, and Cochi. Occupied by the Portuguese in 1503, Kochi was the site of the first European colonial settlement in India. It remained the capital of Portuguese India until 1530, when Goa became the capital. The city was later occupied by the Dutch, the Mysore and the British. Kochi was the first princely state to willingly join the Indian Union, when India gained independence in 1947.