The Regency Acts are Acts of the British Parliament passed at various points in time, to provide a regent if the British monarch were to be incapacitated or in minority (under the age of 18).
In late 1810, King George III was once again overcome by mental illness. Parliament agreed to follow the precedent of 1788; without the King's consent, the Lord Chancellor affixed the Great Seal of the Realm to letters patent naming Lords Commissioners. The Lords Commissioners, in the name of the King, signified the granting of the Royal Assent to a bill which became the Care of King During his Illness. Parliament restricted some of the powers of the Prince Regent (as the Prince of Wales became known). The constraints expired one year after the passage of the Act.
The importance of this Regency Act was that it did not require a Council of Regency, as required by previous legislation. One reason for this was that the Prince Regent was heir to the throne in any case, and would assume full powers upon his father's death.