The question asks for information about the actions of an unspecified person in the 12th century. Without additional context or information about which historical figure is being referred to, it is not possible to provide a specific answer. Typically, such a question would expect details of a known person's life, achievements, contributions, or significant events that occurred during their time in the 12th century. This could encompass a variety of areas such as politics, war, culture, religion, or science depending on the individual in question.
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