Conversation so far:
What happened in 1830 for Robert Gascoyne-Cecil, 3rd Marquess of Salisbury?
In 1830, Robert Gascoyne-Cecil, 3rd Marquess of Salisbury, was born.
Where did Robert Gascoyne-Cecil, 3rd Marquess of Salisbury, attend school?
In 1840, Robert Gascoyne-Cecil, 3rd Marquess of Salisbury, went to Eton College; however, he left in 1845 because of intense bullying.

Question: Why was he bullied?
Self-contained rewrite: Why was Robert Gascoyne-Cecil, 3rd Marquess of Salisbury, bullied at Eton College?