In 1771 , he was appointed a Privy Counsellor ( PC ) .
In 1771 , he was briefly served as Lord Privy Seal before becoming Secretary of State for the Northern Department under Lord North from 1771 to 1779 .
In 1771 , he was appointed a Privy Counsellor ( PC ) and briefly served as Lord Privy Seal before becoming Secretary of State for the Northern Department under Lord North from 1771 to 1779 .