Image source: http://www.churchill-society-london.org.uk/StGeorge.html. Source says "Middle ages parliament".

Same image here http://www.360degrees.org/timeline/era1/era1_b.html, which says "The English Parliament Meets before Edward" by Anonymous, c.1327, this puts the King as Edward III who would have been about 15 at the time.

Same image, not in colour, is here: http://www.bbc.co.uk/history/timelines/britain/mid_fr_gascony.shtml, which says image is Edward in front of parliament in 1295. This would have been Edward I, who would have been about 58.

According to J. Cannon and R. Griffiths, The Oxford Illustrated History of the British Monarchy (Oxford, 1988), p. 193, the image depicts Edward I presiding over parliament in c.1278. Edward is flanked by Alexander III of Scotland and Llywelyn the Last of Wales, although they probably did not attend any of Edward's parliaments. The closed crown indicates that this is not a contemporary illustration, and indeed it can be found in the Garter Book written and illustrated for Sir Thomas Wriothesley in c.1524. The lords spiritual are seated to the king's right, the lords temporal to his left, and in the centre sit the justices and law officers. No commons are present at this session.

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1. ↑ Catalogue entry from 'Royal Treasures, A Golden Jubilee Celebration', London 2002, quoted by the Royal Collection website[1]
2. ↑ Catalogue entry (referring to a similar 1523 illustration (Royal Collection, RCIN 1047414[1] Author Sir Thomas Wriothesley (c.1460-1534))) from 'Royal Treasures, A Golden Jubilee Celebration', London 2002, quoted by the Royal Collection website[2]