  In the process of searching the Hubble Space Telescope archive, we have
serendipitously discovered three populous Large Magellanic Cloud (LMC) clusters
with ages that place them in the LMC `age gap.'. These clusters - NGC 2155,
SL663, and NGC 2121 - turn out to have [Fe/H] ~ -1.0 and ages of ~4 Gyr. This
puts them in the age gap between the intermediate-age LMC clusters, the oldest
of which are ~2.5 Gyr old, and ESO121-SC03, which has an age of ~9 Gyr. The
addition of these three clusters to the LMC age - metallicity relation has
reduced the discrepancy between the age distribution of the LMC clusters and
the field stars. Furthermore, it indicates that searches to find more clusters
older than ~2.5 Gyr in the LMC are crucial to a better understanding of its
global star formation history.
