Answer:
Bolivar has helped a number of modern South American states become independent from the Spanish rule. Eventually, he became the Venezuelan President.
San Martin was a general, who participated in the Spanish-American war of independence, and was the first president of Peru (under the name of "Protector of Peru").
Dom Pedro was a Portuguese King (which at the time included Brazil as well), who declared independence of Brazil, and reigned over Brazil only after that.