We report the discovery of ancient massive merger events in the early-type galaxies NGC1380 and NGC1427 in the Fornax galaxy cluster. Both galaxies are observed by the MUSE IFU instrument on the VLT, as part of the Fornax3D project. By fitting recently-developed population-orbital superposition models to the observed surface brightness as well as stellar kinematic, age, and metallicity maps, we obtain the stellar orbits, age and metallicity distributions of each galaxy. We then decompose each galaxy into multiple orbital-based components, including a dynamically hot inner stellar halo component which is identified as the relic of past massive mergers. By comparing to analogues from cosmological galaxy simulations, chiefly TNG50, we find that the formation of such a hot inner stellar halo requires the merger with a now-destroyed massive satellite galaxy of 3 . 7 + 2 . 7 − 1 . 5 × 10 10 M (cid:12) (about 1 / 5 of its current stellar mass) and of 1 . 5 + 1 . 6 − 0 . 7 × 10 10 M (cid:12) (about 1 / 4 of its current stellar mass) in the case of NGC1380 and NGC1427, respectively. Moreover, we infer that the last massive merger in NGC1380 happened ∼ 10 Gyr ago based on the stellar age distribution of the re-grown dynamically cold disk, whereas the merger in NGC1427 ended t (cid:46) 8 Gyr ago based on the stellar populations in its hot inner stellar halo. The major merger event in NGC1380 is the first one with both merger mass and merger time quantitatively inferred in a galaxy beyond the Local Volume. Moreover, it is the oldest and most massive one uncovered in nearby galaxies so far.