The theory remains tenuous, however, due to lack of evidence, but if proven correct, will further support the idea that Pre-Contact Chamorros lived in a vibrant and dynamic environment.
The first known contact between Guam and Western Europe occurred when a Spanish expedition led by Ferdinand Magellan, a Portuguese explorer sailing for the Holy Roman Emperor King Charles I of Spain, arrived with his 3-ship fleet in Guam on March 6, 1521 after a long voyage across the Atlantic and Pacific Oceans, from Spain.
Most of what is known about Pre-Contact ("Ancient") Chamorros comes from legends and myths, archaeological evidence, Jesuit missionary accounts, and observations from visiting scientists like Otto von Kotzebue and Louis de Freycinet.
When Europeans first arrived on Guam, Chamorro society roughly fell into three classes: matao (upper class), achaot (middle class), and mana'chang (lower class).
Quipuha granted the lands on which the first Catholic Church in Guam, the Dulce Nombre de Maria Cathedral Basilica, was constructed in 1669.The original inhabitants of Guam are believed to be descendants of Austronesian people originating from Southeast Asia as early as 2000 BC, having linguistic and cultural similarities to Malaysia, Indonesia, and the Philippines. They flourished as an advanced, horticultural and hunting society.They were expert seafarers and skilled craftsmen familiar with intricate weaving and detailed pottery who built unique houses and canoes suited to this region of the world.Archaeological evidence also suggests that Chamorro society was on the verge of another transition phase by 1521, as latte stones became bigger.
Assuming the stones were used for chiefly houses, it can be argued that Chamorro society was becoming more stratified, either from population growth or the arrival of new people.There were also "makhanas" (shamans) and "suruhanus" (herb doctors), skilled in healing and medicine.