154979
Life He was the son of Thomas de Clifford , 6th Baron de Clifford , by Elizabeth de Ros , daughter of Thomas de Ros , 5th Baron de Ros , by Beatrix de Stafford .
 Thomas de Clifford , 6th Baron de Clifford, Elizabeth, Ros, Thomas de Ros , 5th Baron de Ros
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Thomas de Clifford , 6th Baron de Clifford, Elizabeth, Ros, Thomas de Ros , 5th Baron de Ros