CIROS was founded in March 2018 by a group of students who felt as though there was a gap in services and activities provided for the new formed IRO Programme at Leiden University (Campus The Hague). They sought to fill this gap themselves with CIROS. Since its initial founding CIROS has grown from five committees to nine, through which CIROS achieves its three aims. These are to provide relevant and interesting extra-curricula activities, to produce help and advice that international (and home) students ordinarily have difficulty accessing, and to improve their social student lives.