Legal history: England & common law tradition: Treason

In English common law there was petty treason - for example when a wife killed her husband (but not vice versa), or a servant his/her master/mistress, or a priest his superior - instances were the murderer owed particular 'faith and obedience' to their victim. Treason Act 1351

High Treason against the reigning sovereign.

Until 1814 the particular heinousness of the crime could mean the convicted traitor suffered hanging, drawing, and quartering.
Remained a capital offence until the bringing into force of the Crime and Disorder Act 1998 c 37 s 36, when replaced by life imprisonment.

Attainder meant that the punishment could extend to the next generation: heirs of traitors could be prevented from inheriting property or titles.

Treason Act 1351 (25 Edw 3 stat 5 c 2)
(a) conspiracy to kill the sovereign, his queen, or the heir apparent;
(b) violating the royal blood line
(c) fighting against the sovereign within the sovereign's kingdoms, helping his enemies
(d) the killing of certain officers of state ( Lord Chancellor, Lord High Treasurer, judges) when they are carrying out their official functions

Henry VIII
The Treason Legislation of Henry VIII (1531-1534): Alexander Prize Essay, 1916
I. D. Thornley Transactions of the Royal Historical Society Vol. 11 (1917), pp. 87-123

Some of the subsequent legislation on treasonable offences

Treason Act 1702 (1 Anne stat 2 c 21)
Treason Act 1790 (30 Geo 3 c 48)
Treason Act 1795 (36 Geo 3 c 7)
Treason Act 1814 (54 Geo 3 c 146)
Treason Act 1842 (5 & 6 Vict c 51)
Treason Felony Act 1848 (11 & 12 Vict c 12)

Requires Oxford SSO for remote access. The official edition of pre-1713 legislation - but not complete, and not without apocrypha (per Baker, IELH 3rd edn 219). This link takes you to v. 1 - use Related Volumes links in the left hand column for speedy navigation to later volumes. Contents v.1: temp unknown, Hen1 to Edw3. v.2: Ric2 to Hen7; v.3: Hen8; v.4: Edw6 to Jas1; v.5: Chas 1 & 2; v.6: Jas 2, W & M; v.7 Wm3; v.8: Anne regnal years 1-6; v.9 Anne regnal years 7-13; v.10 Chronological Index; v.11 Alphabetical Index

Law reports with KB or AC in citation can be read online in either/both the databases below.
All ER reports are only available via LexisLibrary - in the case of Joyce below, you don't have to read both versions: the AC report is considered the more authoritative

R v Lynch [1903] 1 KB 444
R v DeJager [1907] AC
R v Ahlers [1915] 1 KB 616
R v Casement [1917] 1 KB 98

Joyce v DPP [1946] AC 347, [1946] 1 All ER 186

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