Who was King Wenceslas? And the the Feast of Stephen?

As every Czech knows, 'Good King Wenceslas' (907–935) is known by several names. The story of his short life is like a plotline from Game of Thrones

Why ‘the feast of Stephen’?
Stephen is widely acknowledged as the first Christian martyr — his death was witnessed and recorded by Paul. His ‘feast’ is the Second Day of Christmas — the 26th December. This is now more commonly known as Boxing Day in most of the English-speaking world (though not the USA)

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