Many have compared Beowulf to Martin Luther King, Jr. in the modern age because both strove to free an oppressed people, and stood for right even though it was not popular or safe. However, despite these comparisons, while Beowulf fought against a legendary flesh and blood monster, MLK fought against the insidious and more subtle monster of racism.
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If you want to do a comparative study of this fictional character and Martin Luther King, you must first see what the similarities between them, and then create a thesis statement based on one or two main features for both. You can get a good idea http://www.essaywriting.ae/thesis/