Matrae, ārum, f. (dat. plur. MATRABVS, for Matris, Inscr. Grut. 29, 1), or Matres, more freq. Matronae,
the protecting goddesses of a country, city , or place : MATRIS AVGVSTIS D. D., Inscr. Grut. 90, 1; so ib. 2 sq.