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In 1862 he was appointed professor of systematic theology at the University of Giessen , and in 1868 moved to Heidelberg as a successor to Richard Rothe ( 1799 – 1867 ) .
 University of Giessen, Heidelberg, Richard Rothe
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 University of Giessen, Heidelberg, Richard Rothe