65 AD., Nero, Lugdunum mint, Sestertius, unlisted, cf. RIC 438.

Nero, Lugdunum (Lyon) mint, emission 3, 65 AD.,
Æ Sestertius (34-35 mm / 26,52 g), brass, axes about coin alignment ↑↓ (ca. 200°),
Obv.: NERO CLAVD CAESAR AVG GER P M TR P IMP P , his laureate head facing r., small globe at point of neck (RIC obverse type 30B).
Rev.: PACE P R TERRA M[ARIQ PART]A IANVM CLVSIT / S - C , Janus temple with a closed door to right.
cf. RIC I (new), 177, 438 var. (obv. type 31B , ... IMP P P) ; BMC 319 var. (same) ; WCN 419 var. (same) .

In ancient Rome, the main Temple of Janus stood in the Roman Forum. It had doors on both ends, and inside was a statue of Janus, the two-faced god of boundaries. The Temple doors (the "Gates of Janus") were closed in times of peace and opened in times of war.

The closing of the Temple doors was a very rare event. It is said to have happened for the first time under King Numa Pompilius (715-673 BC.), for the second time under Titus Manlius in 235 BC, three more times by Augustus in 29 BC, 25 BC, and possibly 13 BC a sixth time by Nero in 66 AD and a seventh time under Vespasian in AD 70. It is likely that Trajan and Hadrian and Antoninus Pius each closed the Gates of Janus once.