Others were stamped with a quadriga and called quadrigati. The bigati seem to have circulated freely in foreign lands, cf. Ukert's Geog. of Greeks and Romans, III. 1: Trade of Germany, and places cited there. "The serrati and bigati were old coins, of purer silver than those of tho Emperors." Ky. Cf. Pliny, H. N. 33, 13. Sequuntur. Sequi==expetere. So used by Cic., Sal., and the best writers.