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Abridged for arXiv: In this work, we apply a powerful new technique in orderto observationally derive accurate assembly histories through a self-consistentcombined stellar dynamical and population galaxy model. We present thisapproach for three edge-on lenticular galaxies from the Fornax3D project -- FCC153, FCC 170, and FCC 177 -- in order to infer their mass assembly historiesindividually and in the context of the Fornax cluster. The method was tested onmock data from simulations to quantify its reliability. We find that thegalaxies studied here have all been able to form dynamically-cold (intrinsicvertical velocity dispersion $\sigma_z \lesssim 50\ {\rm km}\ {\rm s}^{-1}$)stellar disks after cluster infall. Moreover, the pre-existing (old) highangular momentum components have retained their angular momentum (orbitalcircularity $\lambda_z > 0.8$) through to the present day. Comparing thederived assembly histories with a comparable galaxy in a low-densityenvironment -- NGC 3115 -- we find evidence for cluster-driven suppression ofstellar accretion and merging. We measured the intrinsic stellarage--velocity-dispersion relation and find that the shape of the relation isconsistent with galaxies in the literature across redshift. There is tentativeevidence for enhancement in the luminosity-weighted intrinsic vertical velocitydispersion due to the cluster environment. But importantly, there is anindication that metallicity may be a key driver of this relation. We finallyspeculate that the cluster environment is responsible for the S0 morphology ofthese galaxies via the gradual external perturbations, or `harassment',generated within the cluster.

The Fornax3D project: Assembly histories of lenticular galaxies from a combined dynamical and population orbital analysis