Who is President Rivero from Kon-Tiki: Across the Pacific by Raft and what is their importance?

President Rivero of Peru grants a meeting with Thor. The meeting does not start out well due to language barriers, but with an interpreter, President Rivero enthusiastically supports Thor's voyage. The President grants anything that Thor might need to construct the raft as the voyage will enrich Peruvian history and promote current national interests.