laesae majestatis crimen

from Bouvier's Law Dictionary, Revised 6th Ed (1856)
LAESAE MAJESTATIS CRIMEN. The crime of high treason. Glanv. lib. 1, c. 2; 
Clef des Lois Rom. h.t.; Inst. 4, 18, 3 Dig. 48, 4; Code, 9, 8. 
    

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