The Privy Council gained prominence when Georg Ludwig became King of Great Britain and Ireland in 1714, leaving management of Hanover to the states via his reglement.
At times, the Privy Council was very powerful, especially after the accession of George III, who never personally traveled to Hanover nor left a regent in his stead.
After 1813, Adolphus, Duke of Cambridge was installed as Governor of Hanover (later to be promoted to Governor-General in 1816, and then Viceroy in 1831), slowly ending the relative autonomy of the Privy Council.
While technically all the ministers of the council were equal in rank, a head was appointed for the purpose of calling, opening, and closing meetings.
This individual, although technically equal to the other members, often became the leader of the Privy Council and would direct decisions.