known only from a letter of Gregory the Great (Ep. iii. 19
of 593 A.D., but probably dating from the early empire. It was near
the church of S. Matteo in Merulana, that is, near the place where the
Via Machiavelli crosses the old Via Merulana (HJ 351; HCh 386;
Henze in Misc. Ehrle ii. (Studi e Testi 36) 405).