Table:
text: List of countesses of Flanders
, 1405–1482
, 1405–1482
Name_ Father Birth Marriage Became_Countess Ceased_to_be_Countess Death Spouse
Isabella of Portugal John I of Portugal ( Aviz ) 21 February 1397 7 January 1430 7 January 1430 15 July 1467 husband`s death 17 December 1471 Philip II
Margaret of York Richard Plantagenet, 3rd Duke of York ( York ) 3 May 1446 9 July 1468 9 July 1468 5 January 1477 husband`s death 23 November 1503 Charles II

Question: Regarding the list of Countesses of Flanders, when did the person born May 3, 1446 cease to be a Countess 1405 1482?

Question: When was the marriage of the person who died 17 December 1471 in the list of Countesses of Flanders 1405–1482?