Article snapshot taken from[REDACTED] with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
The Lex Julia de maiestate, the Roman legislation on treason attributed to Julius Caesar, has not survived, but can be reconstructed in part from the commentaries on it in Part 48 of the Digesta.
References
S. H. Cuttler, The Law of Treason and Treason Trials in Later Medieval France (Cambridge University Press, 2003), p. 7.