14988
At the same time his mother just started her literary career ; she published her first book in 1810 , a biography of her friend Karl Ludwig Fernow , which was a critical success .
 Karl Ludwig Fernow
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Karl Ludwig Fernow