not all, of the Christian Chinese creole families fully Hispanicised themselves culturally. The most commonly known source of the city's name is from the Biga'a plant, which once grew abundantly along the banks of the Mestizo River, from which captain Juan de Salcedo derived the city's name (after a misunderstanding with the locals, thinking he was asking the name of the plants). Other names The city's full name at the time of its Spanish foundation was Villa Fernandina, or "Town of Ferdinand", in honor of Prince Ferdinand, the firstborn son of King Philip II of Spain. As the city grew, and the seat of the Archdiocese of Nueva Segovia transferred to Vigan, it was later renamed Ciudad Fernandina de Vigan ("Ferdinand's City of Vigan/Fernandine City of Vigan"). History Due to silting of the Mestizo River, Vigan City is no longer separated from the mainland, therefore no longer an island. The city is unique in the Philippines because it is one of many extensive surviving Philippine historic cities, dating back to the 16th century. Vigan was a coastal trading post long before the Spaniards arrived; Chinese traders sailing from the South China Sea came to Isla de Vigan (Island of Vigan) via the Mestizo River that surrounded it. On board their ships were seafaring merchants who came to trade goods from other Asian kingdoms in exchange for gold, beeswax, and other mountain products brought by the indigenous peoples from the Cordillera region. In the book The Philippine Island (Vol. III, p. 276, Blair and Robertson) two letters from Governor-General Guido de Lavezaris to King Philip II of Spain mention: "It seemed best to send Captain Juan de Salcedo with 70 or 80 soldiers to explore the coast of Los Ilocanos on the shores of the river called Bigan." The Spaniards led by Salcedo marched north from Manila on May 20, 1572. They arrived in Vigan on June 13, 1572. Thus, after the successful expedition and the exploration of the North, Juan de Salcedo founded "Villa Fernandina de Vigan" in honor of King Philip II's son, Prince Ferdinand, who died at the age of four. From Vigan, Salcedo rounded the tip of Luzón and proceeded to pacify Camarines, Albay, and Catanduanes. As a reward for his services to the King of Spain, Salcedo was awarded the old province of Ilocos, which consisted of the modern provinces of Ilocos Norte, Ilocos Sur, Abra,