  Context. The Magellanic Clouds are our nearest star-forming galaxies. While
the population of high-mass X-ray binaries (HMXBs) in the Small Magellanic
Cloud (SMC) is relatively well studied, our knowledge about the Large
Magellanic Cloud (LMC) is far from complete given its large angular extent and
insufficient coverage with X-ray observations. Aims. We conducted a search for
new HMXBs in the LMC using data from eROSITA, the soft X-ray instrument on
board the Spektrum-Roentgen-Gamma (SRG) satellite. Methods. After confirming
the nature of eRASSU J052914.9-662446 as a hard X-ray source positionally
coincident with an early type star, we followed it up with optical
spectroscopic observations from South African Large Telescope (SALT) and a
dedicated NuSTAR observation. Results. We study the broadband timing and
spectral behaviour of the newly discovered HMXB eRASSU J052914.9-662446 through
eROSITA, Swift and NuSTAR data in X-rays and the Optical Gravitational Lensing
Experiment (OGLE) and SALT RSS data at optical wavelength. We report on
detection of the spin period at 1412 s and suggest an orbital period of the
system of ~151 days, and thereby establish eRASSU J052914.9-662446 as an
accreting pulsar. Further, through optical spectroscopic observations and the
existence of H alpha emission the source is identified as a Be X-ray binary
pulsar in the LMC. We also investigate the variability of the source in the
optical and X-ray regime over the last decades and provide estimates on the
possible magnetic field strength of the neutron star.
