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His military career was more active , joining the invasion of Scotland in 1335 , was stated to have been present at the battle of Cadsant in 1337 ( although this is regarded by some as a translation error by his descendent John Bouchier ) and travelled with Earl of Northampton on Edward III 's expedition to Flanders in 1338 .
 Edward III
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Edward III