During the reign of Henry VIII, the statute books had proliferated with legislation creating numerous new forms of high treason. In the first year of the reign of his successor, Edward VI, Parliament passed this Act, which abolished all kinds of treason except:
those contained in this Act,
those in the original Treason Act, and
treason consisting of counterfeiting coinage or forging the king's seals.
However the Act expressly did not apply to people who had already been indicted for treason or misprision of treason. The Act also abolished all new felonies created in Henry's reign.
Two witnesses rule
Section 22 of the Act prescribed that in order to indict, arraign or convict a person for high treason, petty treason or misprision of treason, they must be "accused by two sufficient and lawful witnesses." However, the witnesses did not have to have witnessed the same overt act of the offence. This rule was abolished in 1554, except for treason under the Treason Act 1554. However it was later adopted in the Sedition Act 1661 and the Treason Act 1695, the latter of which was inherited by the United States due to its origins as part of the British Empire. In 1787 a version of the two witnesses rule was included in Article III of the U.S. Constitution, which added that both witnesses had to have witnessed the same overt act. Article III reads: "No Person shall be convicted of Treason unless on the Testimony of two Witnesses to the same overt Act, or on Confession in open Court." The rule as stated in the 1695 Act was extended to Scotland in 1709 and Ireland in 1821, although in 1800 the rule was abolished for cases of attempting to assassinate the king. It remained in force in Great Britain until 1945, when it was repealed by the Treason Act 1945. During the passage of the Treason Bill through Parliament in 1945 the Home Secretary, Sir Donald Somervell, explained the repeal of the rule as follows:
New offences under the Act
The Act created three new kinds of high treason:
Saying that the King was not the Supreme Head of the Church was a misdemeanour, a second such offence was a felony, and a third offence was treason. To say so in writing was treason for a first offence.
To attempt to deprive the King or his successors of his title, or to say that somebody else should be king, was treason.
These provisions were all repealed by the Treason Act 1553, the first Act to be passed in the reign of Mary I. However the second on the above list was soon re-enacted in the Treason Act 1554. The 1554 Act also made it an offence to say that the King or Queen should not have their title, which was punishable by "perpetual imprisonment" for a first offence and treason on the second offence, or treason on the first offence if done in writing.
Other provisions
Section 19 stipulated that a prosecution for treason consisting only of "open preaching or words only" must be brought within 30 days of the offence. Section 20 of the Act put the common law offence of misprision of treason on a statutory basis. Section 21 made it lawful to address the King of France by that title. Up until then, the English kings had claimed that title for themselves.
