What was Margaret of Burgundy's role in the the rebellions against Henry VII?

Answer 1

Margaret of York (May 3, 1446 – November 23, 1503) - also by marriage known as Margaret of Burgundy - was a daughter to Richard Plantagenet, 3rd Duke of York and Cecily Neville, a sister of Kings Edward IV of England and Richard III of England, third wife to Charles the Bold, Duke of Burgundy.

As a Yorkist, after the deaths of her brothers, King Edward IV and King Richard III of England, Margaret, by then Dowager Duchess of Burgundy, became a staunch supporter of anyone who challenged Henry VII's hold on the throne of England, including Lambert Simnel and Perkin Warbeck. Although Warbeck was undoubtedly an impostor, Margaret acknowledged him as her nephew, Richard of Shrewsbury, 1st Duke of York.