YES was founded as the
European Community Organisation of Socialist Youth (ECOSY) in November 1992 in Oegstgeest/
The Hague. The preparatory committee consisted of Philip Cordery (MJS, France), Joris Jurriëns (JS-PvdA, Netherlands), Jens Geier (Jusos, Germany), Giustina Magistretti (Italy), and Pascal Smet (Belgium). Before 1992 the European activities had been coordinated inside IUSY, especially in the
European Leaders Meeting. The
European Socialist Youth (ESY), founded in parallel, was only a weak organisation, a short time later renamed the
European Committee, one of the IUSY continental committees. The organisation's name was changed to
Young European Socialists (YES) at the 11th Congress in
Bommersvik in 2013. == Affiliated organisations ==