Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Name | Father | Birth | Marriage | Became Countess | Ceased to be Countess | Death | Spouse |
| --- | --- | --- | --- | --- | --- | --- | --- |
| Margaret of Bavaria | Albert I, Duke of Bavaria ( Wittelsbach ) | 1363 | 12 April 1385 | 21 March 1405 husband's accession | 10 September 1419 husband's death | 23 January 1423 | John |
| Michèle de Valois | Charles VI of France ( Valois ) | 11 January 1395 | June 1409 | 10 September 1419 husband's accession | 8 July 1422 | 8 July 1422 | Philip II |
| Bonne of Artois | Philip of Artois, Count of Eu ( Artois ) | 1396 | 30 November 1424 | 30 November 1424 | 17 September 1425 | 17 September 1425 | Philip II |
| 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:
When was the marriage of the person who died on 17 December 1471?
Answer:
7 January 1430