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Young field stars are hardly distinguishable from older ones because theirspace motion rapidly mixes them with the stellar population of the Galacticplane. Nevertheless, a careful target selection allows for young stars to bespotted throughout the sky.  We aim to identify additional sources associated with the four young comovingstars that we discovered towards the CO Cepheus void and to provide acomprehensive view of the Cepheus association.  Based on multivariate analysis methods, we have built an extended sample of193 young star candidates, which are the optical and infrared counterparts ofROSAT All-Sky Survey and XMM-Newton X-ray sources. From optical spectroscopicobservations, we measured their radial velocity with the cross-correlationtechnique. We derived their atmospheric parameters and projected rotationalvelocity with the code ROTFIT. We applied the subtraction of inactive templatesto measure the lithium equivalent width, from which we infer their lithiumabundance and age. Finally, we studied their kinematics using the second Gaiadata release.  Our sample is mainly composed of young or active stars and multiple systems.We identify two distinct populations of young stars that are spatially andkinematically separated. Those with an age between 100 and 300 Myr are mostlyprojected towards the Galactic plane. In contrast, 23 of the 37 sources youngerthan 30 Myr are located in the CO Cepheus void, and 21 of them belong to thestellar kinematic group that we previously reported in this sky area. We reporta total of 32 bona fide members and nine candidates for this nearby (distance =157$\pm$10 pc) young (age = 10-20 Myr) stellar association. According to thespatial distribution of its members, the original cluster is already dispersedand partially mixed with the local population of the Galactic plane.

Discovery of new members of the nearby young stellar association in Cepheus