John Locke was a 17th century English philosopher who made several important contributions. He believed that sensations arise from objects themselves, not from perceptions within the perceiver. He also believed that people are naturally free and equal, with rights like life, liberty and property. While he and Thomas Hobbes agreed government was necessary, Locke disagreed that a single ruler was required. Locke rejected innate ideas and believed knowledge comes from experience and perception, which he categorized as intuitive, demonstrative, or sensitive.