King & Conqueror is produced by The Development Partnership, Rabbit Track Pictures, Shepherd Content, RVK Studios and CBS Studios, in association with the BBC. The series is created and written by Michael Robert Johnson with the opening episode directed by Baltasar Kormákur.

The series also stars Jean-Marc Barr as King Henry, Elliott Cowan as Sweyn, Bjarne Henriksen as Earl Siward, Oliver Masucci as Baldwin, Indy Lewis as Margaret, Jason Forbes as Thane Thomas, Ingvar Sigurdsson as Fitzosbern, Ines Asserson as Judith, Sveinn Ólafur Gunnarsson as Hardrada and Léo Legrand as Odo.

King & Conqueror is the story of a clash that defined the future of a country – and a continent – for a thousand years, the roots of which stretch back decades and extend out through a pair of interconnected family dynasties, struggling for power across two countries and a raging sea. Harold of Wessex and William of Normandy were two men destined to meet at the Battle of Hastings in 1066; two allies with no design on the English throne, who found themselves forced by circumstance and personal obsession into a war for possession of its crown.