Lewis & Short

trĭbūlis, is, m. [tribus], one of the same tribe with another.

  1. I. Lit. (class.): tribulis tuus, Cic. Fam. 13, 23, 1; Ter. Ad. 3, 3, 85; Cic. Planc. 19, 47; id. Rosc. Am. 16, 47; id. Vatin. 15, 36; Liv. 2, 16, 5; Hor. Ep. 1, 13, 15 Orell. ad loc.
  2. II. In gen., one of the lower classes of the people, a common or poor person (rare), Mart. 9, 50, 7; 9, 58, 8.