A complete critical evaluation of all available phase diagram and thermodynamic data has been performed for all condensed phases of the (LiCl + NaCl + KCl + MgCl2 + CaCl2 + CeCl3) system, and optimized model parameters have been found. The (LiCl + NaCl + KCl + MgCl2 + CaCl2) subsystem has been critically evaluated in a previous article. The model parameters obtained for the binary and ternary subsystems can be used to predict thermodynamic properties and phase equilibria for the multicomponent system. The Modified Quasichemical Model for short-range ordering was used for the molten salt phase, and the Compound Energy Formalism was used for the various solid solutions. (C) 2018 Elsevier B.V. All rights reserved.