Question:
Which position did Charles Owen O'Conor hold in Aug, 1866?

Context:
 Charles Owen O'Conor holds the position of Member of the 18th Parliament of the United Kingdom from Mar, 1860 to Jul, 1865. 
 Charles Owen O'Conor holds the position of Member of the 19th Parliament of the United Kingdom from Jul, 1865 to Nov, 1868. 
 Charles Owen O'Conor holds the position of Member of the 20th Parliament of the United Kingdom from Nov, 1868 to Jan, 1874. 
 Charles Owen O'Conor holds the position of Member of the 21st Parliament of the United Kingdom from Jan, 1874 to Mar, 1880.

Answer:
Member of the 19th Parliament of the United Kingdom