I / intercessor
noun

intercessor

gen. intercessōris · gender masculine · decl. 3rd
one who intervenes
one who intervenes.
A mediator; a surety
A mediator in money matters, a surety: utinam semper esses tribunus: intercessorem non quaereres, Cic. Fam. 7, 27, 1; id. Rosc. Am. 38, 110: rem aliquam agere intercessore ac deprecatore aliquo, App. Mag. 60, p. 313, 18: intercessorem quaerere, Quint. Decl. 300: nolo per intercessorem mutueris, Sen. Ep. 119 init.
A fulfiller; performer
A fulfiller, performer, Cod. Just. 1, 42, 8; 8, 17, 7.—
One who interposes; enters a protest
One who interposes, enters a protest.
A protester;
A protester; of a tribune of the people who makes use of his veto, Cic. Agr. 2, 12: agrariae legi intercessorem fore professus est, id. Sull. 23: legis, Liv. 4, 53: (Caesar) restitit, partim per intercess?*!res tribunos, etc., Suet. Caes. 29.—
a hinderer; preventer
In gen., a hinderer, preventer, Cic. Rosc. Am. 38: rei malae, id. Leg. 3, 4 and 19.