Sir Keir Starmer, the UK’s new prime minister, brings an impressive CV: barrister, former director of public prosecutions, and ex-shadow Brexit secretary. An establishment insider who knows his way around the corridors of power, he is no stranger to leadership. But that does not necessarily make him a good leader, nor even indicate his potential to become one. Being a member of a privileged elite might land you a plum job, but it does not make you good at it.

Our ancient Welsh forebears knew this well, telling stories to expose bad and promote good uses of power, as my research has shown. Starmer could do a lot worse than to read the Four Branches of the Mabinogion from Welsh mythology during his first few weeks in office. From those skilfully fashioned tales of lordship, he might learn a lot about how to conduct himself as head of government. And, crucially, how not to.