Question:
Which position did William Hay, 10th Marquess of Tweeddale hold in Jan, 1901?

Context:
 William Hay, 10th Marquess of Tweeddale holds the position of Member of the 19th Parliament of the United Kingdom from Jul, 1865 to Nov, 1868. 
 William Hay, 10th Marquess of Tweeddale holds the position of Member of the 21st Parliament of the United Kingdom from Aug, 1878 to Dec, 1878. 
 William Hay, 10th Marquess of Tweeddale holds the position of Member of the House of Lords from Dec, 1878 to Nov, 1911.

Answer:
Member of the House of Lords