When the Sovereign appoints Lords Commissioners to perform certain actions on his or her behalf (for example, to open or prorogue Parliament, or formally declare Royal Assent), the Lord Speaker is one of them. The other Lords Commissioners, by convention, are the Leader of the House (who has acted as the principal Commissioner since the Lord Chancellor's functions were transferred to the Lord Speaker), the leaders of the other two major parties in the Lords, and the Convenor of the Crossbenches.