King Kamehameha IV and Queen Emma (later called Kaleleonalani), enjoyed a very short reign in Hawaii, from 1856 to 1863, and were loved because of their care and concern for improving the lives of their people.
You can read more about them here and here. They look like such a beautiful couple and seemed to have been very happy in their very brief time together.
This is one of those lovely sets that I would really enjoy cutting, but since I've never seen it anywhere else, I'm going to keep it intact. The paper it is printed on is likewise lovely: textured and thick. The colors are absolutely vibrant. I acquired this off of that evil place known as eBay for a very reasonable price (it seemed).