1452
In order to better counter the spread of Uniatism , Mar Severus took up deep study of the history of the Church , which he believed would help to find arguments against the truth of Catholicism .
 person: Mar
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Mar