Wikipedia
Lord Keeper of the Great Seal
The Lord Keeper of the Great Seal of England, and later of Great Britain, was formerly an officer of the English Crown charged with physical custody of the Great Seal of England. This position evolved into one of the Great Officers of State.
Usage examples of "lord keeper of the great seal".
He became successively a member of the Privy Council (1616), Lord Keeper of the Great Seal (1617), Lord Chancellor (1618).