Barry John's four goals drop Llanelli

They call it Judgement Day, and on Saturday more than 60,000 fans will watch Wales' four rugby regions in action at the Principality Stadium in Cardiff.

The showpiece of the domestic game in Wales - in its fourth season - will see Cardiff Blues tackle Ospreys followed by Newport Gwent Dragons against Scarlets.

Get in the mood with some classic Welsh derby moments.

Here, Wales legend Barry John delivers four precise drop-goals to help Cardiff beat Llanelli 12-9 at the Arms Park in 1970.

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