495
He left Colonel Isaac Ewer in command of a small force to besiege the Royalist garrison of Chepstow Castle which was under the command of Sir Nicholas Kemeys and pressed on to join Horton at Tenby arriving on 15 May .
 person: Isaac Ewer; person: Nicholas Kemeys; person: Horton; location: Tenby
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: Isaac Ewer, Nicholas Kemeys, Horton, Tenby 
Answer:
 person: Isaac Ewer; person: Nicholas Kemeys; person: Horton; location: Tenby