In particle physics, the Sakata model of hadrons was a precursor to the quark model. It proposed that the proton, neutron, and Lambda baryon were elementary particles (sometimes referred to as sakatons[1]), and that all other known hadrons were made of them. The model was proposed by Shoichi Sakata in 1956.[1][2] The model was successful in explaining many features of hadrons, but was supplanted by the quark model as the understanding of hadrons progressed.