protestatory
/prəʊˈtɛstət(ə)ri/adjective
Of, relating to, or expressing protest; taking the form of a protest.
Origin
Early 17th century; earliest use found in Miles Smith (d. 1624), bishop of Gloucester. From classical Latin prōtestāt-, past participial stem of prōtestārī protest + -ory. Compare French protestatoire, Italian protestatorio.