Help To Identify A Coin From Nottinghamshire

Hi I recently found the following coin in a spoil heap from the bottom after excavations (1.7m) which cut accross what might have been an old moat or ditch for my house, with a history which goes back to 1300s at least. Struggling to identify it. On one side it has a man or women with a robe hanging loose. below the feet is a dot with 6 dots around it. on the other side is a shield with horizontal lines on the left two quadrants, and what looks like a single lion on the bottom right quadrant. There is a ring of writing on the circumference on both sides. A colon is used as a separator of some of the words. Does anyone please know what this coin is please?