Guest starring Lindsay Duncan as Queen Annis, His Father’s Son airs at 8.10pm on Saturday 29th October on BBC One and sees Arthur face his first true test as King. With the lives of thousands hanging in the balance, Arthur must find the strength to be his own man and become the leader Camelot so desperately needs.

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> Order the Series 4 Volume 1 DVD on Amazon.

Watch the Series 4 trailer, with an exclusive introduction by Nathaniel Parker for CultBox…