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We report the discovery of a previously unknown eruption of the recurrentnova M31N 2017-01e that took place on 11 January 2012. The earlier eruption wasdetected by Pan-STARRS and occurred 1847 days (5.06 yr) prior to the eruptionon 31 January 2017 (M31N 2017-01e). The nova has now been seen to have had atotal of four recorded eruptions (M31N 2012-01c, 2017-01e, 2019-09d, and2022-03d) with a mean time between outbursts of just $929.5\pm6.8$ days($2.545\pm0.019$ yr), the second shortest recurrence time known for any nova.We also show that there is a blue variable source ($\langle V \rangle =20.56\pm0.17$, $B-V\simeq0.045$), apparently coincident with the position ofthe nova, that exhibits a 14.3 d periodicity. Possible models of the system areproposed, but none are entirely satisfactory.

M31N 2017-01e: Discovery of a Previous Eruption in this Enigmatic Recurrent Nova