Petite treason was that by a wife to her husband or a man to his lord.
"Our Legal Heritage, 5th Ed." by S. A. Reilly
Merchants who had signed the petition asking the council to remove the racks began to denounce the removal as an act of treason.
"In Our Town" by William Allen White
I cannot say I had as much tolerance for the patriotism of Miss Bayard as I had for the petit treason of my sister.
"The Chainbearer" by J. Fenimore Cooper