We – my colleagues and I – had heard the rumours for weeks: some 50 individuals were being moved around the country. It seemed, even then, ominous. Saudi Arabia appeared to be preparing a mass execution.

One prominent name, Sheikh Nimr, was invariably mentioned. Yet his execution, we foresaw, would clearly ignite a firestorm – for he was a revered and senior Shi’a scholar, the leader of the Shi’a of the Eastern Province of Saudi Arabia and beyond; a man known for his commitment to nonviolence, and an upholder of the rights of Shi’a minorities throughout the Gulf. The US and Iran had both warned the Saudis in advance of the likely consequences of his beheading.