This is one of the coloring pages newly made especially for The Day-by-Day Coloring Book of Saints, Volume 2, which contains saints for every single day of July through December. It's available here or from Amazon.
St. Hedwig, or Jadwiga, was king of Poland. That's right, she was officially "king" even though she was a woman, or girl rather, at her coronation she was 12 years old! Her day is July 17.