4565
The present form of the city dates from reconstruction in the late 9th century , when King Alfred the Great obliterated the Roman street plan in favour of a new grid in order to provide better defence against the Vikings .
 person: Alfred the Great
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: Alfred the Great