Final answer:
The reference material does not provide information about the specific Portuguese adventurer who abducted Indians from Maine. It instead covers the broader Portuguese exploration and colonial history during the Age of Discovery, referencing various significant figures and events.
Step-by-step explanation:
The question pertains to a Portuguese adventurer involved in the abduction of more than 50 Indians from Maine. However, the provided reference material does not contain any specific information about this individual or event.
The material instead covers the broader context of Portuguese exploration and colonial activities, including the first arrival of the Portuguese in the Americas with Pedro Cabral, Portugal's claim over Brazil, the Treaty of Tordesillas, the conquests and activities in other regions like Malacca and Africa, and Portuguese navigation feats such as Diaz and da Gama's voyages.
Portuguese explorers, traders, and conquerors played critical roles in the Age of Discovery and established various trade routes and colonies around the world during this period. The actions of these Portuguese adventurers had lasting impacts on the indigenous populations they encountered, including forced migrations and enslavement, although details of the specific adventurer from the question are not available in the reference provided.