The Lauterpacht Centre for International Law (LCIL), University of Cambridge hosts a regular Friday lunchtime lecture series on key areas of International Law. Previous subjects have included UN peacekeeping operations, the advisory jurisdiction of the International Court of Justice, the crime of aggression, whaling, children and military tribunals, and theories and practices for proving individual responsibility criminal responsibility for genocide and crimes against humanity. This lecture entitled 'On the Siren Song of Sui Generis: Customary law, humanitarian law, and the ILC' was delivered on Friday, 16 January 2015 by Robert Cryer, Professor of International and Criminal Law, University of Birmingham, UK. For more information about the series, please see the LCIL website at www.lcil.cam.ac.uk