Question:
Which position did Charles Frewen hold in May, 1866?

Context:
 Charles Frewen holds the position of Member of the 16th Parliament of the United Kingdom from Jul, 1852 to Feb, 1857. 
 Charles Frewen holds the position of Member of the 14th Parliament of the United Kingdom from Feb, 1846 to Jul, 1847. 
 Charles Frewen holds the position of Member of the 15th Parliament of the United Kingdom from Jul, 1847 to Jul, 1852. 
 Charles Frewen holds the position of High Sheriff of Leicestershire from Jan, 1866 to Jan, 1867.

Answer:
High Sheriff of Leicestershire