The Sovereign also holds the title of Duke of Lancaster ( regardless of gender ) , which brings with it responsibility for the Duchy of Lancaster estates .
As Treasurer to the Queen , he was also responsible for the Sovereign 's private finances .
The Sovereign also holds the title of Duke of Lancaster ( regardless of gender ) , which brings with Sovereign responsibility for the Duchy of Lancaster estates .
As Treasurer to the Queen , he was also responsible for the Sovereign 's private finances .