“In 1544, touring the southern sea is Captain Pastene, named by Pedro de Valdivia as captain and Lieutenant General of the Sea. On the 18th of August, commanding his boat, San Pedro, and sailing in the company of the treasury of Her Majesty, Jerónimo de Alderete, and the notary Juan de Cárdenas, on the 27th of September 1544, they sighted the mouth of the Bío Bío...” (Fernando Campos Harriet) The expedition of Captain Pastene towards the southern seas allowed him to identify the area where today called the eighth region. His reports would motivate Pedro de Valdivia to continue his conquest toward the South, a conquest that he would undertake with a select group of soldiers, and that, in the year 1550, allowed him to camp in the Valley of Andalién.