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The Gangani ( Γαγγανοι ) were a people of ancient Ireland who are referred to in Ptolemy 's 2nd century Geography as living in the south-west of the island , probably near the mouth of the River Shannon , between the Auteini to the north and the Uellabori to the south .
 person: Ptolemy
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Ptolemy 
Answer:
 person: Ptolemy