sentences:  On 12 January 1412, Katherine was married at the age of 12 to John Mowbray, 2nd Duke of Norfolk (1392–1432).Their only known child was John de Mowbray, 3rd Duke of Norfolk (1415–1461).Katherine married for a second time to Thomas Strangeways (c. 1395-before 1442) - they had 2 daughters