This article aims to carry out an exhaustive analysis of the genealogy of the Riudarenes lineage, one of the most distinguished families of 18th century Catalonia. The entire study has been structured through methodical research and comparative analysis of different documentation, although the partially preserved inventory of Josep de Riudarenes i d’Oms, the fourth Marquis of Moja, has been key in obtaining very valuable historical information. and make the present study much more understandable.