Maybe some of our fellow British noders can correct me but I believe this oath, written in 1689, is still in use today when a new King and Queen are (what we would call in the states) sworn in.
Coronation Oath of 1689
Whereas by the
law and
ancient usage of this
Realm, the
Kings and
Queens thereof have taken a solemn oath upon the
Evangelists at their respective coronations, to maintain the
statutes, laws, and
customs of the said Realm, and all the
people and inhabitants thereof, in their
spiritual and
civil rights and properties: but forasmuch as the
oath itself on such occasion administered, hath heretofore been framed in
doubtful words and expressions, with relation to ancient laws and constitutions at this time unknown: to the end therefore that one uniform oath may be in all times to come taken by the Kings and Queens of this Realm, and to them respectively administered at the times of their and every of their
coronation: may it please your Majesties that it may be
enacted
II. And be it enacted by the King's and Queen's most
excellent majesties, by and with the
advice and consent of the
Lords Spiritual and
Temporal, and the
Commons, in this present
Parliament assembled, and by the
authority of the same, That the oath herein mentioned, and hereafter expressed, shall and may be administered to their most excellent majesties King William and
Queen Mary (whom
God long preserve) at the time of their coronation, in the presence of all persons that shall be then and there present at the solemnizing thereof, by the
Archbishop of Canterbury, or the
Archbishop of York, or either of them, or any other
bishop of this Realm, whom the King's majesty shall thereunto appoint, and who shall be hereby thereunto respectively authorized; which oath followeth, and shall be administered in this manner; that is to say,
III. The archbishop of bishop shall say, "Will you solemnly
promise and
swear to
govern the people of this Kingdom of
England, and the
dominions thereto belonging, according to the statutes in Parliament agreed on, and the laws and customs of the same?"
The King and Queen shall say, "I solemnly promise so to do."
Archbishop or bishop, "Will you to your power cause law and
justice in
mercy to be executed in all your judgements?"
King and Queen, "I will."
Archbishop or bishop, "Will you to the utmost of your power maintain the laws of God, the true profession of the
gospel and the
Protestant reformed
religion established by law, and will you preserve unto the bishops and
clergy of this Realm, and to the churches committed to their charge, all such rights and privileges as by law do or shall appertain unto them, or any of them?"
King and Queen, "All this I
promise to do."
After this, the King and Queen laying his and her hand upon the
holy Gospels, shall say,
King and Queen, "The things which I have here before promised, I will perform and keep:
So help me God."
IV. And be it enacted, That the said oath shall be in like manner administered to every King and Queen, who shall succeed to the
imperial crown of this Realm, at their respective coronations, by one of the archbishops or bishops of this Realm of England, for the time being, to be thereunto appointed by such King or Queen respectively, and in the presence of all persons that shall be attending, assisting, or otherwise present at such their respective coronations; any law, statute, or usage to the contrary notwithstanding.