4680
Various unconfirmed versions of his early life exist , but tax records indicate he may have left the country in 1723 or soon afterward , and Finnish and Swedish tradition recounts that he joined the bodyguard of Frederick William I of Prussia , which was composed of unusually tall soldiers and was nicknamed the Potsdam Giants .
 person: Frederick William I of Prussia
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: Frederick William I of Prussia