Formation histories of the HESTIA simulations: formation distance of stars as a function of lookback time, colour-coded by the stellar mass (in log₁₀ units). The diagrams include all the in situ stars, merger remnants, and satellites that survived until z = 0. The HESTIA galaxies show a diverse assembly history with substantial early accretion and a different number of massive dwarfs in the halo at the present epoch.